ok so about two weeks ago my boyfriend and i tried having sex no condom (i know stupid) he got the head in, no stroking then we stopped, for some reason i am scared about pre cum if he pre came, i know he didn't fully cum. he stresses and is 100% sure that he did not pre cum at all or even cum a little bit. i am terrified that i am pregnant my period was suppose to come on the 22nd and it didnt i have had cramps like my period was starting but not blood my nipples just got sore today, and my cramps are kind of bad like my period, i have been nauseous BUT i have been having that problem randomly for some MONTHS before i even considered this. my period came on in december on the 25th so im guessing im not regular. what should i do ? i can't get this off my mind am i stressing to much?