I went to the doctor's office again today and had another ultrasound.
Of course we won't know 100% until the babies are born, but we were told that baby A is a girl and baby B a boy! Yes, a set. One of each.
I guess we won't have to ever worry about telling them apart, we can always just check.
We are thrilled! (of course we were thrilled when we thought it was two girls also) It is so fun to think about what life might be like with two little babies.