I was sexually active a little over four months ago and my period has been extremely light since then. Right after I had sex I was worried about being pregnant. My stomach was hurting and I was nausea a lot. Now I m peeing a lot and have this strange weird pressure feeling. My stomach still hurts from time to time. It was the first time I had a true sexual experience. The other times were forced. What could be causing my period to be that way and for me to have that feeling in my vagina now?