HELP! Chances of pregnancy.

Thank you eve! I know when I'm ovulating now. But the down side is, I'm very forgetful and had unprotected sex today... He cummed in me... Not all of it has come out (tmi). Anyways what I'm trying to get at is I know when my cervix is open...and it was today... But does this mean I could actually end up prego? I have a feeling it might end up that way...but HELP!!! Any advice will work!!!