After sex

So last night my partner and I had sex , this is going to sound so stupid but usually his cum won't come out of me untill the next day but after I had gotton up has a shower and gone to loo I jumped back into bed. Had abit of wind that I let loose and then felt a gush come out wasn't sure if I had peed myself or if it was cum or amniotic fluid . Wasn't w great deal but enough to wet my undies . I just changed them and went back to sleep now I'm worried .