A member asked:

My girlfriend is having bad cramps and has a rash on her stomach after taking plan b. the thing is though she took plan b in january and it is now the end of march. she missed her period for this month. pregnancy test is negative. whats wrong here?

3 doctors weighed in across 2 answers

Menstrual irregularities are not uncommon and anovulatory cycle is a common cause. If you miss more than two periods it would be time to see your doctor. If you do not wish to be pregnant, use contraception all the time. You may consider implanted contraceptive or an IUD. Consult this site. http://www.nichd.nih.gov/health/topics/menstruation/conditioninfo/Pages/causes.aspx

Answered 3/28/2022

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PLAN B can cause menstrual irregularity. Her cycle should return to normal on its own. The rash is not common and could be related to other products in the PLAN B pill. It should resolve. Confirm the pregnancy test is negative by repeating in 1 week.

Answered 3/31/2022

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