A member asked:

Had sex with my girlfriend 2 weeks ago..i came in her but i have her the plan b pill right after. she said her cycle came thursday but it was earlier ?

2 doctors weighed in across 2 answers
Dr. John Wigneswaran answered

Specializes in Nephrology and Dialysis

Thoughts: Check a pregnancy test- that is the only way to be sure. Plan B is not 100% effective, and less effective after 72 hours.

Answered 2/16/2015

3.2k views

Thank
Dr. Heidi Fowler answered

Specializes in Psychiatry

Early Period.: Potential side effects w emergency contraception includes menstrual flow changes (spotting, bleeding, early or late period). This could be a side effect from Plan B.

Answered 10/31/2017

494 views

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