An IUD is a little T-Shaped piece of plastic inserted into the uterus to provide birth control.
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Pro: 
it's over 99% effective.
The Copper ones work better
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Con:
It can get you pregnant once you remove it
Side effects may include:
-Irregular menstrual periods, Change in flow
-Breakthrough bleeding
-Back Pain
-Headaches, Nervousness, and Mild Dizziness
and
-Nausea, Vomiting, or Bloating
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Where you can get it from
You can get it from your nurse or doctor to insert it in for you. It costs between $0-$1,300
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Interesting Facts:
-It can make your periods better
-They are really convenient
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When couples talk about using it they might talk about the possible side effects as well as the unexpected pregnancy.

it's a white sponge that can be inserted into the vagina up to 24 hours before sex. It blocks the sperm from entering the uterus, while also releasing spermicide. It's sold at some drug stores.

pros:
doesn't affect hormones
while it's in you can have as much sex as you want
costs $0-$15 dollars, depending on where you get it
you can use it while breastfeeding
no prescription needed

cons: 
it can cause vaginal irritation
some women have a hard time getting it in
no protection against STI's
women who are allergic to spermicide shouldn't use it
failure rate is higher for women who have children

stats:
75-88% effective if used correctly
12-24% failure rate

How to use:
1: wash hands with soap and water
2: wet sponge with at-least two tablespoons of water
3: give the sponge a gentle squeeze, to activate the spermicide
4: dimple side facing up, fold the sponge in half
5: slid it into your vagina as far as your fingers can reach 
6: when you let go the sponge should fold out and cover your cervix
7:  feel around with your finger to make sure it's in place, you shoulder feel the nylon loop on the bottom of the sponge.
8: and your done, know you can only use it once

Taking it out:
1: wait six hours before you take it out
2: wash hands with soap and water
3: put a finger in your vagina and search for the loop
4: pull out slowly and gently
5: throw it away, don't flush it.

People can buy them at drug stores. They cost between $15 to $50 dollars. 

Pros: Very effective against pregnancy if used correctly (91-99% effective), Makes menstrual periods more regular and lighter, Decreases menstrual cramps and acne, Makes you less likely to get ovarian and uterine cancer, pelvic inflammatory disease, ovarian cysts, and anemia, Doesn’t interrupt sexual activity

Cons:Doesn’t protect against STIs, Depending on your insurance, your birth control may be free or there may be a copay, Need to remember to take every day at the same time, Can’t be used by women with certain medical problems or by women taking certain medications, Can occasionally cause side effects such as nausea.

You can get birth control pills at drugstores, health clinics, or Planned Parenthood health centers. You need a prescription for birth control pills. They can cost about 15-50$ a month.