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Ovulation is where a mature egg is released from the ovary for fertilization. This happens in the fallopian tube around 12-24 hours after unprotected sex.

This usually happens about 14 days before a woman's next period,

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This is where the egg and sperm meet, this is known as conception. This union usually happens during the 12-24 hour period since ovulation.

Fertilization happens in the fallopian tube near the ovary. Fertilization also happens around 24 hours after ovulation.

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This is where the fertilized egg or blastocyst attaches to the uterus wall/lining. This usually happens around 6-11 days after fertilization.

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The first trimester is the weeks 1-12.

The first trimester is the most important trimester, this is because at these weeks 1-12 the baby is growing and developing all the things he or she will need for life outside the womb. Although a woman may be pregnant, the couple or woman may save the news until the second trimester. This is because most miscarriage's happen in the first trimester so usually couples or the mother waits.

During the first trimester, the mother's body will suffer with major changes. These will be changes like frequent urination, breast tenderness, fatigue and nausea. All of these may not happen to every woman because everyone is different, but these are the symptoms of the first trimester.

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The first day of a woman's last period is when the weeks of pregnancy are dated. The body is preparing for ovulation (which is where an egg is released from one of the ovaries).

Day 1 : First day of period
Day 14 : Ovulate - Within 24 hours of ovulation the egg is now fertilised by sperm if sexual intercourse has occurred in the last few days without protection/contraception
5-6 days after ovulation : Fertilised egg implants into the lining of the womb
Pregnancy now occurs

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Within the lining of the womb, the embryo is growing and developing.

Outer cells form links with the blood supply of the mother. The inner cells from from 2 layers into 3. These layers will grow and form different parts of the baby's body.

The inner layer becomes the digestive and breathing systems like the lungs, stomach, gut and bladder.
The middle layer becomes the blood vessels, muscles, bones and heart.
The outer layer becomes the nervous system and brain, skin, tooth enamel, nails and the eye lenses.

The embryo at this stage in pregnancy is attached to a tiny yolk sac that provides nourishment which is called an amniotic sac. A few weeks later, a placenta is fully formed and will transfer the nutrients to the embryo. The outer layer of the amniotic sac develops into the placenta. Cells from the placenta grow into the wall of the womb and provide a rich blood supply. This makes sure that the baby receives all the nutrients and oxygen it needs.

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At this many weeks, the embryo is around 2mm long. The nervous system is developing and the foundations for the major organs are in place. The heart is forming and the baby has some of its own blood vessels. Blood will begin to circulate.

An umbilical cord also develops. A string of blood vessels will connect the baby to the mother. The embryo's outer layer of cells folds to form a neural tube which is hollow. This will become the baby's brain and spinal cord.

Defects in one end of the neural tube lead to spina bifida. Folic acid prevents spina bifida and when a woman finds out she is pregnant she should start taking this. When the bones of the skull do not form properly, it is called anencephaly.

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At this many weeks pregnant, a large bulge where the heart is and a bump at the end of the neural tube. The bump will become the brain and head.

The embryo is now curved and has a tail. The heart can sometimes be seen beating on a ultrasound scan. The developing arms and legs now become visible. Ears will also appear as little dimples and thickenings appear where the eyes will appear.

By this stage, the embryo is now covered with skin which is see-through.

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The embryo has now grown to around 10mm long from head to bottom, this is called the crown-rump length which is the measurement.

At this point the head is growing faster than the rest of the body because the brain is growing rapidly. The eyes and ears are still developing and the embryo has a large forehead. The outer ears will not appear for a couple more weeks but the inner ears start to develop.

Limb buds start to form cartilage and will develop into the bones of the arms and legs. As the arm buds get longer, the ends flatten out and these become the hands. The brain and spinal cord start to take shape and the nerve cells continue to develop and multiply.

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The baby is now an offspring which is called a foetus.

Even though the different parts of the leg aren't properly connected yet the legs are getting longer. There is still some time before the knees, thighs, ankles and toes develop.

The foetus is still inside the amniotic sac and still gets nourishment from there, the placenta is still continuing to develop and is forming structures that attach the wall of the womb to the placenta.

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At 9 weeks, the baby's face is now forming and the baby is about 22mm long from head to bottom. The eyes are more obvious and bigger, and have some pigment in them. There is now a tongue with tiny taste buds and a mouth.

The major inside organs like the heart, brain, kidneys, lungs and gut continue to develop. The hands and feet are also developing, ridges are where the toes and fingers will be although they aren't separated out yet.

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If the baby's face was visible, an upper lip and 2 tiny nostrils have now developed. The ears and ear canals are also forming on the sides of the head and inside the head.

Jawbones are developing and contain the future milk teeth already. The heart is now fully formed. It beats at 180 times a minute which is 2-3 times faster than the human heart.

The baby is also now moving and making jerking movements that can be seen on an ultrasound scan.

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The placenta is developing rapidly and the baby is growing quickly. It will be fully formed at around 12 weeks.

The earbuds are developing and will look more like ears as they grow, the bones of the face are now formed.  The eyelids are closed and will not open for a couple of months yet.

The body is growing fast, it's straightening and the fingers and toes are seperating. The baby's head makes up one-third of its length and there are now fingernails.

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12 weeks after the last period a woman has, all the muscles, organs limbs, bones are all in place and sex organs are now developed. The foetus is fully formed.

A mother cant feel the movements yet, but the baby will be moving.

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The second trimester is the weeks 13-27.

Most of the painful/unpleasant symptoms disappear at this trimester. The mother will usually have more energy and will be able to get her sleeping schedule back to normal. Although all of the other symptoms have gone, there are others which are introduced to the mother anytime around when the second trimester starts. These include heartburn, constipation, pain in the back, the abdomen and cramps in the legs.

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The genitals of the baby are now forming outside their body, the baby now weighs around 25g. The baby's testes or ovaries have now fully developed inside he or she's body.

Even though the parents will not be able to find out the sex of the baby at this stage with an ultrasound scan, the penis or clitoris is now growing.

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At 14 weeks, the kidneys start to work and the baby begins to swallow bits of amniotic fluid which will travel into the stomach. The swallowed fluid parts pass back into the amniotic fluid as urine.

The baby is now around 85mm from head to bottom.

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The baby will now start to hear muted sounds from the outside, the noises the mothers digestive system makes and the sounds of the mother's voice and heart.

The babies eyes will now become sensitive to light, they could see bright light outside the mothers tummy.

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Facial expressions start to appear, which the baby cannot control. The muscles of the baby's face will start to move.

Around 16 weeks, the baby's hands can reach each other. They can also form a fist and can hold together when both hands touch. The nervous system continues to develop which allows the muscles in the baby's hands to flex.

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At 17 weeks, lines are forming on the skin of the baby's fingers and they also have individual fingerprints. The baby has a firm hand grip and fingernails and toenails are now forming.

The baby is now growing quickly, and weighs around 150g. The baby's eyes can now move although the eyelids are shut, but the mouth can open and close. The face is now beginning to look more human like and eyelashes and eyebrows are now beginning to grow.

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The baby is now moving a lot and any loud noises from the outside world such as music they may respond to. The mother may not feel these movements yet but if they do, it will feel like a fluttering sensation.

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If the mother could see her baby now, he or she would look wrinkled. The baby is now putting on weight but does not have much fat, the baby will continue to put on weight and will look more filled out by the last few weeks before birth.

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At 20 weeks, the baby is covered in vernix which is a white, greasy substance that helps protect the skin whilst the baby is in the amniotic fluid.

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The baby now weighs around 350g which is equivalent to a banana, this means that the foetus will weigh more than the placenta which was heavier than the baby before now. The placenta will grow alongside the baby but not as fast.

Lanugo will now cover the baby. Lanugo is soft, fine hair which is said to keep the baby at the right temperature.

Lanugo is normally gone before birth.

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If the mother is in bed at night trying to sleep or is just feeling relaxed, the baby may move because he or she is wide awake. This is because the baby is getting into a pattern/schedule of sleeping and waking up which can be completely different to the mothers schedule.

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At 23 weeks, the baby is practicing breathing movements to prepare for life outside the uterus. Although, the lungs cannot work properly at this stage.

The baby gets all their oxygen from the mother through the placenta until they are born.

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At this stage, the baby has a chance of survival if they are born. Most babies born before this time/week cannot live because their vital organs and lungs are not developed enough to help them live. Babies born around this time have an increased risk of a disability.

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At this many weeks, the mother is now able to feel if the baby moves or kicks. This is because he or she is now responding to touch and sound and may jump if someone or something makes a loud sound. Sometimes the baby may get hiccups and the mother will be able to feel each jerk of each hiccup.

The baby is passing urine frequently into the amniotic fluid.

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The baby's eyelids now open for the first time and soon after this, they will start to open and close (blink). After the baby is born, the eye colour the baby's eyes are wont stay the same because after a couple of weeks the colour will change and a colour will stay and remain.

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At 27 weeks, the baby's heartrate has now slowed down and is around 140 beats per minute. It is still faster than a humans usual heart rate. The brain, lungs and digestive system are still developing. They have formed but are not fully mature.

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The third trimester is the weeks 28-40+.

Because this is a new trimester, other symptoms will appear such as sleeping problems, urinary incontinence (which is where there is a small amount or a big amount of urine lost) and also hemorrhoids (which is swelling of veins near the end of the rectum). Most of these symptoms are mostly caused because at this stage of pregnancy the uterus increases in size. Before pregnancy the uterus weighs around 2 ounces but once a woman has been through pregnancy, at the end the uterus weighs around 2.5 pounds.

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At 28 weeks, the baby is perfectly formed and weighs around 1kg. The baby will keep putting on weight and more fat will appear under the skin.

The mother's partner will be able to hear the heartbeat if they put their ear to the mother's tummy.  A stethoscope detects someone's breathing or a heartbeat.

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The baby will be very active at this stage, which means he or she will be moving around quite a lot. Any unusual movements that are not known to the mother should be reported to her midwife or hospital.

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At 30 Weeks, reflexes are now developing like the sucking reflex which is where a baby sucks its fingers or thumb for comfort.

Lanugo will now start to slowly disappear and the baby's skin will start to smoothen up and will look less wrinkled.

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Although the baby will not be able to breathe on he or she's own until about 36 weeks the lungs are developing rapidly. Also the baby's eyes can now focus.

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Cephalic presentation is now in place, this is where the baby is lying with their head first which means the baby is ready for birth. If they are the other way round with the feet first this can be a danger and the mother will have to have a C-Section.

The baby is still swallowing amniotic fluid and passing it out as urine.

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At this many weeks of pregnancy, the nervous system and brain are now fully developed.

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Apart from the skull bones, the baby's bones are beginning to harden. This is because the journey through the canal will be easier when they are soft and separated.

Whilst the mother gives birth, the bones move gently and slide over each other so the brain can be protected whilst the baby is being born safely

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At this stage, there will hardly be any room for the baby to move about but he or she will still be able to change position and move. As the baby moves, the mother or anyone near at the time will be able to see the movement on the skin of the bump. The baby at 35 weeks pregnant is now curled up in the uterus. The legs are bent up towards their chest.

If the gender is a boy, testicles are beginning to descend from the abdomen to the scrotum.

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At this point, if he or she is born now they will be able to feed. The baby's lungs and digestive system are all now fully developed and formed.

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The average baby at this point weighs around 3-4kg. A pregnancy at this many weeks is considered full-term.

The baby's digestive system contains a sticky, green substance that contains meconium which will form the first feces/poo of a human. The baby's first poo after birth may include bits of fine hair (lanugo) which is what covered the baby in the earlier stages of pregnancy.

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Not much happens at this point of pregnancy, if the baby is born at this point and poo's during labour. The amniotic fluid may contain meconium, this is a sign that he or she is stressed and the midwife may want to monitor the baby closely to make sure he or she is okay.

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At 39 weeks, the baby is "engaged". This means that the baby's head has moved down into the mothers pelvis. As this happens, the mother may notice that her bump will move down a little bit. Sometimes the head may not engage until labour starts.

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Some babies might have small, little patches of this when they are born but at this point most of the lanugo that once covered the baby's body should be gone.

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As he or she is born, the baby's genitals may look swollen but they will settle down to their normal size not long after. This is because of hormones which are in the mothers body.

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Usually, most women go into natural labour when they are around 42 weeks pregnant.

If a mother goes over 42 weeks, there is a high risk of stillbirth which is where a baby is unfortunately born dead. This may be because of complications with the mother's health or maybe the placenta. Induction is offered to mothers if they do not go into labour by 42 weeks.

If the mother does goes over 42 weeks she can choose to have her labour induced. If she decides not to then the mother should be offered increased monitoring to check the baby's health and well-being.