Hello. I Am Currently 20 Weeks Pregnant. I Have A

Hello. I am currently 20 weeks pregnant. I have a spot, about two inches below my ribs, on the middle right side of my stomach, and when I move, or stretch out a certain way it feels really weird, like a really shakey muscle contraction or spasm (sorry not sure how to explain it). I've had it multiple times for a few weeks now. I was just curious of what it could be.