My period wont come!

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I had sex 2 days ago. We used a condom and he pulled out. I'm getting a little worried because even before we had sex my period seemed kinda late (but then again I don't have a normal cycle). My period still hasn't came! My cervix is kinda lower then yesterday I'm not sire what that means. I don't know why it hasn't came yet. I hope I'm not pregnant!