Leg cramps during pregnancy?

I have had this terrible cramp in my upper, inner thigh...I call it my vagina cramp. It’s been going on for several weeks now, but had started to go away finally, but after work on Saturday night where I took on too much, was on my feet all night, and repeatedly lifted things too heavy, the cramp has returned with a vengeance. I’ve had to call off work, because I’ve been in so much pain and it hurts to walk. Anyone else experienced this during pregnancy? Are there some types of stretches or something I can do to try to ease the pain? I’m only 21 weeks along.