Mothers of di/di twins help!

An
Had our 12 week appointment today, confirmed di/di! I'm 12 weeks exactly and Baby A is measuring 13 weeks and 1 day while Baby B is measuring 11 weeks and 5 days :-/ ! Baby A's hr was 169 while Baby B was 181. Anyone experience this? They've always been a few days apart but baby b was never behind what I was suppose to be. 😢