Leg cramps?

I'm almost 20w with my second. I haven't noticed any swelling in my legs but both legs feel really crampy. It feels as if I just got done running, they hurt from my thighs down to my ankles. I haven't been on my feet much today and I'm actually down 2 lbs since pre pregnancy weight, so I don't think it's the extra weight. Sound normal? I see my doctor this week so I will ask him about it then, but wanted to know if anyone else experienced this.