Stomach pain

Hi all, FTM here, I’m currently 38 weeks pregnant and I’ve been having some stomach pain, but it’s not my actual stomach it’s the muscles on my belly if that makes any sense. Just wondering if anyone else has experienced this and if so do you know what it is. I’m pretty sure it’s probably just from my belly growing but I wanted to ask you guys to see what you think. My stomach isn’t hardening up and it’s not contractions and usually whenever I get the pain I also have a hard time breathing. TIA ❤️