Hi, it could be because of biotin deficiency in Pregnancy. I suggest take Cap Becosules once a day for 15-20days. As well as Iron, Folic acid and other multivitamins as might be prescribed by your your gynecologist. Burning sensation in legs could be because of
vitamin b12-b6 deficiency that occur in
pregnant state due to increased nutritional demand.
Hope it helps. Tc