Starting induction tonight - unexpected!

I am 35+6 and went in for a growth ultrasound today for my di/di twins. Baby A was measuring very small - 4lbs 12ozs and B was 5lbs 5ozs. They checked the blood flow in A’s cord and it looked fine but the doctor still didn’t like the size discrepancy. In previous scans the babies were always almost the exact same size. A’s head was measuring less than .5 percentile. The doctor didn’t seem super concerned - she said I did great making it to 36 weeks and that the measurement could be off because A’s head is down in my pelvis. Still, she said they need to come out. I’m worried sick and feeling very overwhelmed. I was not expecting this at all.