So I had sex nearly four months ago, the condom ripped, but he still pulled out before finishing. I was still concerned so I took plan b the next day and then a week later I started birth control. Is there any chance I could be pregnant?Note Ive had my period every month since being on the pill but I'm not sure if that's just because of the pill. Kind of a stupid question I know, but I've been havin lower back pain and breast aches and got concerned. Please help