First time

I'm very nervous of getting pregnant! When having sex the first time! It is with my boyfriend, we have messed around (we have done everything except have sex). I gave him a hand jod last Saturday then 10mins later he actually stuck his penis on my vagina, he even thrusted a little bit. Is there anyway I could be pregant from his PRECUM? I'm very scared. My period isn't due till around May 8th, and my last period was around April 10!! Am I pregnant??? Please help!!!