It's possible that it is the beginnings of sciatic nerve pain. I had it really bad last pregnancy, and it started out as burning and than as the baby got bigger it turned into a pinching or charlie horse type pain.
My whole right thigh starts burning and it tingles and it's numb when I stand for too long. Sciatica. Ugh.
I would recommend a good chiropractor
They can take care of that naturally with no stress on you or the baby. No need to be in pain