my legs are sore constantly - i'm 35 weeks and it started a couple weeks ago. i mentioned it to my specialist last week and it seems to be the result of water retention but they did tell me to not ignore pain on the inside of my thighs. you might just want to talk to your OB office just to make sure
At the end of both of my pregnancies, my inner thighs were constantly very sore. I couldn't really do anything except walk or it would be almost unbearably painful. It reminded me of the soreness after losing my virginity, but a bit worse.