A member asked:

How long does plan b delay ovulation? i took 2 on 2 diff days and have had unprotected sex several times since. havent had a period yet and i'm late.

A doctor has provided 1 answer
Dr. Amanda Stream answered

Specializes in Critical Care

Cycle dependent: Plan B is a progesterone only pill which prevents pregnancy multiple ways depending on when it is taken during the menstrual cycle. It may prevent or simply delay ovulation if you are near this point in your cycle. If ovulation has already occurred it may prevent fertilization of the egg and further if the egg has been fertilized, it may prevent implantation. Best to get a pregnancy test.

Answered 4/25/2016

3.8k views

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