AM I POSSIBLY PREGNANT!? help

Sooo my boyfriend is in the military and and he came home on leave from AIT for three days (September 2nd-5th) so I seen him the third and we had sex no condom and he pulled out. But the next day we had sex without a condom again then with for round two but he took it off mid sex and still pulled out. I'm scared is it possible that he pre came ? I started my period the day after .. idk help!!???!??!?