Milk during pregnancy

I req for Mamil sample. they sent 2 tins of 400g to my place. didn't even finish the 1st tin. the nutrition found in it is the same as taking prenatal supplements given by Gynae. plus drinking milk contributes to constipation and weight gain. rem to have 2hrs block gap if you take milk and prenatal multi vit Similac tastes pretty awful (sorry!) I take soy milk pretty often throughout