Um... I'm 17 and im scared. Me and my boyfreind had unprotected sex on Oct. 18. Im on birth control pills and i take them faithfully everyday im almost positive he didnt cum in me but i do know u can get pregnant from pre-cum. My period was supposed to come on Oct. 26 but it hasnt. i've had very slight cramps but no bleeding. I took 2 HPT's and they both say negative. I have been stressed lately with alot of things and i was sick last week and had to be put on antibiotics. Does that have something 2 do with it? What do you think i should do? Is it still 2 early 2 tell?