Swelling in 36 weeks of pregnancy and a swelling which has come overnight should always be suspected of blood pressure fluctuation and thyroid imbalance if everything is ok in your report your blood pressure is normal your thyroid was normal and you are not anemic then you need to try this home remedy dip your legs in lukewarm water which contains gypsum salt as well soakp for 20 minutes remove pd dry and put 2-3 pillows beneath your legs and keep it elevated if the swelling reduces then you need not to worry but if the swelling does not reduce very much and returns again that I need to see your doctor tomorrow itself