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.Continue Reading
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.Learn more about Birth Control
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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.Full Answer >
If an IUD falls out, pregnancy may occur. Even if the device becomes partially dislodged, a doctor needs to remove it and replace it with a new one.Full Answer >
According to WebMD, if the morning-after pill is taken within 24 hours after having sexual intercourse, then it is deemed to be 95 percent effective at preventing pregnancy. However, if the emergency contraceptive is taken between 24 and 72 hours after intercourse, the level of effectiveness drops to 89 percent.Full Answer >