HELP A GIRL OUT!!!!!!!

So I had sex with my boyfriend. I’m 19 and we decided to wait a year before having sex. He’s my first so I’m new at this (in other words no judging lol) I was on the third day of my period (Feb. 17) and we had a condom on. He didn’t pull out but I did fill it up with water afterwards and there were no leaks. I always put it on to make sure its on right too. I have a regular 28-30 day cycle so there’s an EXTREMELY low chance of pregnancy.... right??