for about 2 weeks my stomach started hurting and every time i eat i feel like im going to upchuck but do not! it really feels like im going to start my period but don't... ive been having a little bit of back pains. and starting yesterday ive been feeling like i have to pee but when i go i go very little! i took a test to see if i was prego about 4 or 5 days ago. it was negative.. and my periods not due for about 2 more weeks.. is there a way i could tell if i prego by then?