Could Argipreg Improve Hemoglobin Level And Fetal Weight?

Hi doctor, am 30 weeks pregnant now. On the 3rd month my hymoglobin was 10+ and last month it came down to 8.9 and we checked again this week its 8.1 am trying to eat all but nt able gain and my baby weight is 1.36g now doctor said its under weight and suggested ensure and agripreg for me is this enough to fulfill my problem. Please suggest me.