Plan B, when taken within 72 hours of sex is about 95% effective in preventing pregnancy. Your body aches may be due to hormonal imbalance or due to an unrelated condition. You should do a home pregnancy test 3 weeks after the episode of sex for which you took plan B. If the result is negative repeat the test in 4-5 days. Use first morning urine and follow instructions for the test carefully.
Answered 7/18/2021
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