I'm according to the lmp I'm am to be 13wks pregnant I never keep track of the days I ovulate I had sex with my partner on dec 8 .days later I had sex with a different partner and according to the ovulation predictor I concived around dec 12-15 now I'm not sure of who fathered my baby ?/? :(

You might have to wait until the baby is born and get a paternity test.

All you can do is wait until the baby is born and get a paternity test taken.

I am sorry, but I have to agree with the others. You were playing the sex game before you got pregnant, now you have to play the waiting game to have a paternity test done.