First time

I had sex (19yrs} for the first time ever with my boyfriend(20 yrs) of three years, he wore a condom and didn’t cum the sex lasted about two minutes since we had no idea what we were doing and I got scared. He checked for holes or tears but there weren’t any but I’m still very scared of getting pregnant. I understand that condoms are effective if used properly but since it was my first time i have no idea what effectively means, I know that my period is due in ten days from now which is why I’m scared of the fertile window.