My period was supposed to come around the 18th of March, but it showed up late and was short. I had unprotected sex a few times with my boyfriend at the time and the last time we had unprotected sex was in the beginning of March. We had unprotected sex the day after I finished my period. Right now, I feel nauseous, I'm throwing up from time to time, My lower back and stomach are killing me. It feels like cramps, but not as bad as when I get my period. Today, my body feels sensitive all over. I'm having white, cottage cheese discharge everytime I use the bathroom, and every time I pee it hurts. I'm only 19 yrs old. Can I be pregnant?