i have been on i guess a period for 2 1/2 weeks. it started really lite now its heavy. i have no pain no irritation but a strong odor. i have been under alot of stress so i'm blamming it on that, but now i'm worried. b/c it doesnt seem to be going away. my boyfriend and i do have unprotected sex and have been for 2 yrs. never happened befor why is this happening?