I went to the ER on Feb.11,2012 for headaches they took a pregnancy test and it came back negative, I started taking birth control pills for the first time on Feb 14, 2012. Was not aware you had to wait until you've had a period before you could start taking them. As well me and my Ex boyfriend had unprotected sex on the day I started taking the birth control pills which was the 14th. Today is March 2, 2012 and I have not had a period yet... Last period was in January 27,2012..... Is It the birth control pills or am I pregnant?????