Please answer!!help..what are the chances im pregnant?

my bf and i were messing around a he kep sticking it in for 10 second or so but it was when his want completely erect.i kep touching the tip getting scared he would pre *** but when i would touch it would feel dry.when he got hard hard then he put a condom on and everythin was ok with it when we had but im scared i might have gotten pregn.from when we were messing around at first.plase tell me what are the chances i am??