Low Doppler flow 29w possible delivery

Jenna • We're having twin girls :) Teagan Ann and kenzy rey
Had a ultrasounds at 29w6d  this Morning to check bpp test and Doppler flow flow has continued to decrease in baby A over the past week babyB looks good but they admitted me in the hospital to continue monitoring and said if there is anymore decrease they will be taking the babies I'm scared that they won't be big enough babyA is only 2.3lb baby B is 2.13lb anyone had a similar issue with positive outcome praying they will both be strong