i was due for my period about two weeks ago. all the sudden today my back is killing me, i can't suck in my stomach anymore, and my stomach just randomly hurts. after i used the retroom, i realized i had some blood. i was excited thinking i started my period. but after a couple hours i realized it's just not the same as my periods usually are. it's just ovulation mixed with blood, but not even alot. i can't stop wondering if i'm pregnant. am i?