hi....I'm a female in college. I am sexually active and on birth control. Just so everything is clear, I have taken an at home pregnancy test. It was negative. I only did one. Now, my period has started, but it unusually terrible compared to previous months. The cramps are horrible. I have diarrhea. Also, the weirdest of all, I felt like throwing up, went through the process of throwing up and threw up a little bit. Odd thing is...there was some blood in my throw up. I am unsure what this means. If you could help me in any way, that would be very much appreciated.