Sore stomach?

I've noticed for over the last few days my stomach has been increasingly more sore. Not like round ligament pain pain, but sort of like a pulled muscle type? Not sharp.. But I can't comfortable sit or lay on my right side. I keep saying it's just from my uterus stretching, this is my third. But the pain is getting worse so it's starting to get me curious. Does anyone else feel this? And it seems to be mainly on my right. I'm 17w5d