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
My whole right thigh starts burning and it tingles and it's numb when I stand for too long. Sciatica. Ugh.
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.