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within 24 hours of ovulation and will end within six days after

fertilized egg embedding in the uterus

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occurs at the say time of conception, and ends when implantation of the zygote occurs

cells start dividing

amnion, placenta, and umbilical cord beginning to form

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begins Week 5 and ends the 10th week of pregnancy.

facial features begin forming

ears begin forming

internal organs (heart, liver, digestive system, brain, and lungs) developing

limbs, hands, feet, fingers, and toes developing

tissue segments (future vertebrae) in a spinal column forming

skin developing

limb buds (future arms and legs) appearing

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ninth week after fertilization to about 38 weeks after

fertilization

lanugo disappearing

head hair appearing

eyebrows and eyelashes growing

taste buds developing

muscles forming

fatty tissue forming under skin

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between weeks 16 and 25