Me and my boyfriend had sex about 2 weeks ago and he went inside of me, I took a pregnancy test about 5 days after it was negative. I started my period 2 days after my schduled day whicj was about 2 weeks after sex, or at least I believe I did. Its not a very heavy flow at all . I don't know if I'm pregnant or not, I thought for a fact if some one puts it inside of you, then it's a 99 percent chance I am??