We had our first appointment with our Perinatologist at Northside today. The twins both look perfect in every way!! They had strong heartbeats and measured great. I am 13 weeks 1 day today..... Baby A measured 13 weeks 5 days and Baby B measured 13 weeks 4 days. Dr. Matsumoto is almost certain that they are identical. He said that I have 2 of the indicators (something to do with the uterine wall and the membrane that separates them is less than 2mm). How will we ever tell them apart?!? :o) We will go back in 3 weeks for another ultrasound to check measurements and hopefully gender!!