ok i had sex on April 30 2007,around 11:30 p.m. that night ok i was looking for my period to come in may it didnt come,so i got a pregnant test when i missed my period in the middle of may......so the test told me i was pregnant i thought nothing of it,so on may 31st 2007 i had sex again? so when did i get pregnant to have my baby on Januray 31st 2008??