I had protected sex on April 15 which I figured out later I was ovulating. We used a condom, but his bare penis touched my vaginal area about 20-30 minutes after he previously ejaculated which I swallowed. I got what I think was my period two weeks later and then my next period was 8 days late but I was very stressed and my cycle has never been exactly normal and it lasted my normal 7 days and I got it again just 4 days late now with my normal 7 days of bleeding. I also took 6 pregnancy test that were negative. I'm just worried that they aren't actually periods because I've heard stories on the internet about periods and negative tests but still being pregnant. Please help.