For the past 5 hours I have had a really dull ache in my left leg, similar to a dead leg...Or you know the way your legs can ache when you have flu? The right one's fine though...
Leg cramps I think are just a not nice side effect to being pregnant, I get a lot of them too when pregnant its really annoying!
Where is the ache? Blood clots can happen in pregnancy. If in your calf if get it looked at. Could also just be relates to the extra pressure in the legs. Compression stockings can help.