HELP ME PLEASE!!!

I had unprotected sex with my boyfriend on February 15 and he didn’t pull out, it was one of the days that I was ovulating. I don’t know how accurate it was but I’m curious to know if I can still get pregnant ( we’re not necessarily trying but we’re not avoiding) this is his first ever time not pulling out. It’s been like 4 days and I’ve been have slight slight cramps with weird lower back pains. I’m not exactly sure when I stop ovulating because there’s 3 apps telling me different things but I just want to know what are my chances of getting pregnant this time? I know sperm can live inside you for up to 5 days correct? This is one of the apps!! Oh please tell me if my chances are high or not! I’m not trying to get my hopes up 😕