Twin growth and weights

Pri • Fraternal Twin Boys 👶🏻👶🏻 due Feb 2018!!

How big are/were your babies at week 31? Mine are about 3lbs each. Doctors think they are small. So I’m going in for weekly NST and ultrasound. The babies seem to be in 10 percentile rage per American growth charts. But i’m Asian, so we tend to have smaller babies. Should I be worried? I have di/di babies.