Hi there,
Honestly, I would not touch that stuff while pregnant. Protien shakes is not 100% natural and has a lot of fillers in them. They also are overdone in vitamins which can be very harmful to fetuses. Fetus is still growing and developing, protien shakes can screw up their cells, brain cells, etc. I drank shakes before I got pregnant, stopped while pregnant and nursing then went back to drinking it once a day after I weaned. There are plenty of other food that has protien you can eat without using the shake. Just for the peace of mind, I'd stay away from it until the baby's born. Same for protien bars as they contain some chemicals in them that will likely harm the baby. Personally, it's just me but I prefer to be all natural and organic while pregnant and nursing. After that, I do whatever I want. Good luck and hope this helps!
Lisa