A member asked:

My period was sep 20-sep24 2021. i had intercourse sep262021 took a plan b sep272021 a day before my fertile window, i have tested my lh all negative till this day oct 2 2021. is there any way this plan b could fail?

A doctor has provided 1 answer

Taken within 72 hours of sex, Plan B is about 95% effective. From what you described you risk for pregnancy is virtually nil. If you do not wish to be pregnant, use contraception all the time, every time. You may consider implanted contraceptive, or IUD. Practice safe sex : https://www.hopkinsmedicine.org/health/wellness-and-prevention/safer-sex-guidelines

Answered 10/2/2021

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