Stomach movement

I always have sex with condoms and pull out combined. I’ve been having my period although sometimes I miss a month / am late (due to stress) I’ve taken pregnancy tests each time it was late and they’re always negative and then I get my period.. however I’ve been feeling weird movements in my stomach and idk if it’s because I’m always paranoid of being pregnant or if its gas or something but it kinda freaks me out ??

UPDATE: still having the stomach spasms and idk what to do 😣