Oh yes... I've had that since about week 6. Constant numbness and tingling in my left thigh. A heating pad is the best thing I have figured out for it. But unfortunately there is no permanent relief until probably birth and I'm 32w2d :-\
Where does it hurt? If you can feel it moving in a line down your leg or if it's concentrated in your glutes or in your thigh it's probably your sciatic nerve.
If it is, I suggest lying down on your side, on the opposite side of the pain. You might be down for a while, so make sure you use the bathroom and all first.
Baby is probably on a nerve. Maybe he's ready to come out. ;)