So I'm 18 and I lost my virginity to my boyfriend on Sunday night and on Monday morning I had gotten my period hours later. He had a condom on so we were protected, and hopefully it didn't break. At the beginning of my period, my flow was very thick with many blood clots, which is unusual for me. It is now day three of my period and my flow has been very light, which is usually the same with my other periods on day three. My period last between 4-5 days. Also I would have very tender breasts and bad cramps during my period but I didn't experience it this cycle.