Here's what ob/gyns want you to know. It contains a hormone called levonorgestrel and is more effective within 72 hours of unprotected sex. Learn why you can get pregnant if you have unprotected sex after taking plan b Discover effective birth control methods for pregnancy prevention. You don't, however, have to wait until the morning. The effectiveness of plan b decreases the longer you wait, so taking it sooner is better
After taking plan b, you may feel some side effects, including nausea, abdominal pain, headache, dizziness, or vomiting.
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