On June 14 and 15 I had protected sex with my boyfriend. On the 15th he noticed a small tear near the base of the condom; we changed condoms after this. He didn't finish inside of me but he has orgasmed a few times earlier and I'm afraid there may have been sperm left over. We were both virgins so because I recently became sexually active it messed with my cycle? I've also been stressed because of the condom thing. I haven't taken any tests. I had a one day period about a week ago. It looked like my normal period but only lasted a day and didn't come back. I still have PMS symptoms. I asked my mom about my period but didn't tell her I'm sexually active and she said it was just an irregular period. What's happening?