hi i am Diane and i am 16 i had unprotected sex with my boyfriend the day after my period on the 12 of june. My next period is due next week which is around the 7th. Lately i have been havin trouble sleeping i stay up all night an sleep through the day. I seen a little blood when i went to the bathroom but i have also had headaches an i will eat a little bit of food an become very full then in a little while my stomach will begin to hurt an growl. I have been geting these quick sharp pains in my back and two days ago i was constipated an when i went to the bath room i almost threw up what do you think it could be are these signs of pregnancy?