Growth slowed down?

couple days ago I had my US for growth measurements. Turned out that babies only gained a few ounces in the past month. I was 33 w 3days. Baby A was currently 3.15lbs and baby b is 3.5 lbs. Today was my dr appt, unfortunately she was delivering a baby and wasn't there but left a detailed note for her backup. When they weighed me today, I didnt gain any weight either. So they are referring me to a childrens hospital to see a specialist and get another growth measurement. they said from their experience it's "normal" for twins to sometimes slow down in third trimester since they don't have much room. Or "worse case scenario" is they aren't getting enough from me and will have to be delivered next week. from what they see they are getting blood flow through umbilical cord. Drives me nuts that I have to wait till Monday to see when my appointment is, the hospital is over an hour away. Ugh just had to vent. The dr today made me feel better, I'm almost 34 weeks. I know these are just estimates, but has anyone else experienced this?