I need help:( kind of long story!

Well, I'm 15 and I am sexual active since November. Here is the problem; I had sex the 9th and we didn't use a condom at the beginning but it wasn't more than 5 secs. Then he put it, he never cum inside of me, we are both sure about that! My period came the 15th like a regular period, and ended the 18th. But I have some doubts if I can get pregnant even though my period has been come! I'm really scared😭😩