. I took plan b 3 hours after having unprotected sex essentially and I got a very light period around the time I was expecting it to come and it ended in brownish blood. but now I'm having cramps like I'm about to get it again. I'm a worried that it was not really my period and that I could be pregnant. I'm really stressed out about it and I'm gonna take a test tomorrow morning. and just would Like to know if this has happened to anyone else and if it is safe to continue taking my regular birth control pills. Thanks.