Sex day period ends

I had sex with my boyfriend the day my period ended. We’ve been using condoms a lot recently but this time for some reason we didn’t. He pulled out and came on me not in me but when he was wiping I.T off what if some went near or touched my vagina. Could I be pregnant? I have a 37 days menstrual cycle so I wouldn’t be ovulating for like another 2 weeks so should I be worrying?