Okay so, I'm 19 and I've been sexually active for about 3 years with one guy. Before now, I always had my period about every 21 days and it lasted for 3-5 days. Well, on October 11, I started my period and it lasted (heavily) until October 25. Since then, I've had a brown discharge coming out in my panties. What caused my period to be so long all the sudden. And what is this brown discharge? Could I be pregnant? Please help, I can't get a doctors appt. til' November 8, and I want to get an idea of what could be going on before then.