I'm 20 years old, and I'm currently sick with a cold or something related to a cold. A couple of days ago I was supposed to start my period, and I had red blood with little brownish spots. But now I'm having bad cramps every 10 minutes or less, and now the stuff that was supposed to be blood is now black. My boyfriend and I usually have unprotected sex, but neither of us has AIDS or STDs. And When I do get pregnant, it's usually for 3 months to 5 months and then I misscarry. I'm not even sure if I can have children either. Supposedly I'm healthy, but what could be the problem? I also usually have irregular periods with heavy bleeding and severe cramps, but this feels worse. What's going on with me?