Leg cramps and calf soreness help

Im 38 weeks today and the last week have been having insane calf cramps on both legs. In one leg I've had 3 in a row so bad it's been sore for 2 days straight to the point where im limping to walk anywhere.

I am taking an extra magnesium supplement per my ob, increased water intake and stretching but the soreness/limping will not go away.

Help!!! What can I do? Would laying more vs attempting to walk to rest help??