I’m 17 and I lost my virginity in September and I’ve had sex two times after that. All 3 times we’ve worn a condom and only once did he came. After I lost my virginity, my period was a week late. After the second time, it was late by a few days as well. I had sex almost two weeks ago and my period is supposed to have started on Wednesday. So is it true that sex messes with your cycle?