I wasn't nervous at all before our first ultrasound, then they did the ultrasound and told us we were having identical twins (which is the one thing they got right), and my wife started hitting me. Then they freaked us out by telling us they were cojoined (which they weren't), they were momos (which they weren't, they were actually dimos), that one was at high risk for downs while the other was not (which neither one had downs and is almost statistically impossible). Later in the pregnancy, one thing they didn't diagnose that is usually fatal that we discovered when they did lab work on the placenta after the birth was that they had twin to twin transfusion. Anyhow, the moral of the story is the doctor / ultrasonographer will always tell you worst case scenario in order to cover themselves from being sued, so make sure you do your own research and get a second opinion from a perinatologist if they start freaking you out as many of the measurements they take have a degree of operator error. If you do end up with twins, you will get to spend a lot of time looking at ultrasounds (once every two weeks early on and once a week later in the pregnancy). Being a father is a great(yet stressful) experience and I am a proud to report that I am a dad to two smart, beautiful, healthy, athletic identical twin girls who defy statistics each and every day.