Leg Burning?

Recently I've noticed a pretty bad burning sensation in my left leg. It was only in my thigh but it's kinda spread to the rest of my leg. It makes it difficult to stand or walk & I can't put much pressure on it. Any idea what this could mean..?

Could be a pinched nerve

Does it extend all the way from your butt to your ankles? I had that, I was told it was the sciatic nerve. It sucks, but not much you can do :/

It kinda starts in the middle of my thigh, on the left side, but then I started feeling it on the lower front side of my leg, It's not like all over. I'm hoping it's the sciatic nerve & not a blood clot or something.  

It's probably just a nerve. It's says your due in February, so it's probably just the baby pressing down on some nerves. If it keeps up overnight though, I'd call a doctor, just to be sure, because pregnant woman have a higher risk for clots. Is it swollen and red?