After an extremely long scan, including an internal and a visit by the specialist, I was told that it appeared as though the twins were Mono/Mono (Monochorionic, Monoamniotic: If twins are sharing a placenta and are in the same sac, no dividing membrane can be seen on scan)and told to come back in a few weeks for another scan. I had no idea at the time what any of that meant, I was still dumbfounded at being told I was having twins. I live maybe 10 min's away from the radiologists, but I couldnt wait til I got home to tell my huband so I pulled over and called him. Russ's reponse "You are kidding?" and he didnt believe me. Until we picked up the scans a few days later he really thought I was joking. When I got home, the first thing I did was google (of course) mono/mono twins, completely scaring the crap out of myself. They are the highest risk twins and I thought I was facing a pregnancy full of complications and stress. For the next couple of weeks I tried to not get attached to my babies, alternating between ignoring the fact I was pregnant and imagining the worst. Finally it was time to have another ultrasound and the technician was able to establish that while my boys (woo hoo boys!!) shared a placenta, they had their own sac. What a relief, until I went to my Obs and he wanted a 2nd opinion.