Im 18, I had unprotected sex with my boyfriend right after I got off my period. Im very worried. Someone told me that is when I am most fertile? I took a pregnancy test about 6 days after intercourse and it was negative. But Im assuming that isnt enough time to tell. I started bleeding today and its only about 8 days after my period and they are usually very normal and consistent. My bleeding isnt spotting, its normal for me, which is kind of heavy. Ive been very tired and kind of weak. Could I be bleeding because of stress? Am I pregnant? Ive been kind of nausase but not puking or anything. Please help me.