How far along are you? My twins measured identically until 12 weeks and now the girl is consistently 4 days behind dates and the boy has ranged from right on to 2 days ahead.
I had dreamed I was having triplets before finding out how many thus pregnancy. I dreamed two girls and a boy. Only two of the three babies continued to develop after 6 weeks though. I was pretty confident one baby was a girl but went back and forth on what the other would be.