Easily startled baby

I’m 37&2 today and I’ve noticed loud sounds make my baby jump which obviously it would spook anyone such as a shaving cream can hitting the bathtub. But I notice he also jumps whenever my hips/pelvis pops. I get that it’s probably a loud sound and that’s why he gets startled but I just need someone to tell me I’m over thinking it when I think maybe my pelvis is squishing him and he jumps because it hurts? FTM obviously 🤣