I had sex last night around 3am. and i've been having menstrual like cramping they don't radiate. i'm not sure if they're contractions, am i in labor?

Am I pregnant?: I am not sure what you are really asking. You cannot know if you are pregnant hours after sexual intercourse. The cramping could be from numerous possibilities. To answer your question accurately a doctor would need to know what and when you menstrual periods are like; when your last regular period was and what activity your sexual intercourse included.