unprotected sex during ovulating

I had unprotected sex a few days ago, afterwards saw that according to the app it was my ovulating day, my period is not so accurate so I don't know if it's really the ovulating day.. also we didn't had full sex meaning he was inside for few times but for seconds... I stopped him every time.. I've been feeling cramps since then. I've been pregnant before and I don't know if it's psychological because I'm stressed but it feels like the cramps I had when I was pregnant. what are the chances I'm pregnant after this short penetration...?