I think I'm pregnant 😰

I have been sleeping with one of my guy friends and he has a girlfriend. We never use a condom and I'm not on birth control so it always kind of freaks me out whenever he pulls out because I think that he might accidentally cum inside me. We have slept together multiple times but the last time we did it, it felt different. I'm home on break and I'm not due to get my period for another week but I'm terrified that I'm pregnant because I've been having this weird intuition and some stomach pain. I don't know what to do and if I am I'm afraid to tell him because he has a girlfriend. I'm not proud of what I have done but I'm just looking for some guidance.