So last night I had sex with my boyfriend twice but at different times during the day and both times we used a condom, but both times I got scared that his brother may walk into us going at it so I told him that we should stop and so he didn't cum both times, he didn't even pre ejaculation so is there still a chance that I may become pregnant? My period comes in 9 days and so I'm just nervous I still might have a chance of becoming pregnant!