It is your sciatic nerve, it runs down your back, down your bum and goes down both legs. With getting bigger in pregnancy you are much more likely to have it bother you as it can be pinched or be under more pressure. Nothing you can do about it but rest and put some (light) heat on it. With my first preg I went to the dr because I would fall down it got so bad and the dr said there isn't a thing anyone can do, you just have to wait it out. Hope it feels better soon!
Yes my leg does sometimes ! But my back hurts alot .
My back gets stuck feeling sometimes, especially if I'm leaning or bending over. I've had my leg give out to lol it felt funny like it went jello! So it's happened to me to and I'm fine :)