Bruising or....??

Tiffany 34, 💛💚💛🌈👼🏻 💖💜

I’m 35 weeks and it’s difficult to explain but I am really sore on the upper right side of my belly, like there should be a giant bruise there. I know I didn’t bump it on anything. And I haven’t got any stretch marks (so far). Any ideas on the cause of such soreness??