I was late for my period and suddenly came on before that i had unprotected sex and now i'm kinda on my period but it's as if i am coming off it was really heavy in the beginning but now it's light i my nipples hurt and i don't know if i am pregnant ?

Home Preg Test: Do home pregnancy test on first morning urine. If neg, repeat in 7-10 days. If both neg, unlikely you are pregnant. May just have been a little late with period so more lining builds up that needs to be shed by the uterus and thus a little longer and heavier period. If next 1-2 periods also not normal for you, see your gyn provider for eval. Hope this was helpful. Dr R