Q:

What happens after taking Plan B?

A:

Quick Answer

After taking Plan B, three things may happen in a woman's body to prevent pregnancy. WebMD explains that Plan B One-Step may prevent or delay ovulation, interfere with fertilization of an egg or prevent implantation of a fertilized egg by changing the uterine lining. Plan B does not cause miscarriage or abortion, and it does not stop fetal development once a fertilized egg implants in the uterus.

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Full Answer

According to WebMD, Plan B is a type of over-the-counter emergency contraception. Its dose is a single pill that contains 1.5 milligrams of levonorgestrel. The risk of pregnancy is reduced by up to 89 percent when Plan B is taken within 72 hours of unprotected sex. When taken within 24 hours, Plan B is about 95 percent effective.

Plan B is not as effective as regular contraception, and it should not be used as a woman's main form of birth control. A woman should not take Plan B if she knows or suspects she is pregnant, has a history of allergy to any ingredients in Plan B or has a history of abnormal vaginal bleeding that has not been evaluated by a doctor. Side effects that may occur after taking Plan B include nausea, abdominal pain, fatigue, headache, dizziness, vomiting and breast tenderness. The medication may also cause unexpected bleeding and menstrual changes, notes WebMD.

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Related Questions

  • Q:

    When taking Plan B, when can you get pregnant again after the second pill is taken?

    A:

    According to Princeton University, Plan B only protects against pregnancy for 72 hours before and a few hours after taking it. However, the university does say that no one has studied how many hours of protection it provides after taking it.

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  • Q:

    How effective is Plan B?

    A:

    Plan B One-Step, the latest version of the drug as of 2014, is 95 percent effective if taken within 24 hours of unprotected sex, explains WebMD. The Plan B One-Step official website claims that the pill prevents pregnancy in seven out of eight women who would have otherwise become pregnant.

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  • Q:

    Is it safe to take birth control while pregnant?

    A:

    Taking birth control pills during pregnancy is safe, but there is no benefit to it, explains Mayo Clinic. Minipills or combination birth control pills don't appear to increase birth defect risk, but there is increased risk that the fertilized egg will implant outside of uterus, resulting in an ectopic pregnancy.

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  • Q:

    Are there any safe days to avoid pregnancy?

    A:

    There is no guaranteed safe day to avoid pregnancy, but abstinence during ovulation can substantially reduce your chance of becoming pregnant. Use the rhythm method to recognize the days you are most fertile and do not engage in sex before and during those days to avoid pregnancy.

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