i had unprotected sex on the 19th of feb & it was about 4 days after my last period. i took the plan b pill about within the 72 hours. i had a few side effects but they went away within 2 days but then around march 2nd i started? shedding??? (i am not sure if this is the right word) like you would on your period but it was more brown then red. there was very little blood & this lasted for about 3/4 days. I don't know if this was my period or not because it was light but at the same time i was still shedding like you would on your period. Meanwhile soon after that I experience some lower abdominal pain every now & then which is kind of worrying me... Could there be a chance I'm pregnant?