Unless your diet is severely low in fat I would drink Premier Protein shakes if I were you. 1) They taste MUCH better than Ensure and 2) they have more protein, which is critical for both you and baby during rapid growth. But if you're not getting enough fat either then Ensure may be the way to go. Ensure is designed to keep older adults and those with a serious illness from losing too much weight. Premier Protein is a good supplement to enhance your diet when you're not getting enough to eat. Not a huge difference but there you go.
Re: Ensure
Married: June 2011
TTC since Feb 2016
BFP#1: 7/7/16 MMC: 8/16/16
BFP#2: 5/8/17 - CP
BFP#3: 6/27/17 EDD: 3/10/18