Hello. So I went in today for my ultrasound at 10&5. Baby A was only measuring 10&1 and Baby B was only measuring 10&3. The nurse who was doing the ultrasound didn't seem worried and their hbs were good and they were moving around. Is this common for twins to be a little behind this early? They started out the exact same at 6 weeks but last week at 9&5 A was at 9&2 B was at &3.