Hello,
I had gone through the case and found that it might be decreased due to
poor blood circulation causes
Deep vein thrombosis, which generally happened in
pregnancy.
So initially go for mild
massage of leg and dip the leg in warm water. If not better then go for Doppler study of vein of leg.
Generally it happens in late pregnancy. But do not worry after delivery it will disappear, but meanwhile do whatever i advised you.
Thanks