I had my first ultrasound and found out I was 8w6d instead of 11 weeks like they though. One baby has a strong heartbeat but they saw another yolk sac and what they thought was a smaller fetus. They couldn't hear a heartbeat but it looked like there was a flutter. I go back in two weeks which will tell them if baby #2 is still alive and well or if it will fade off. Has this happened to anyone else? Has anyone had a hard time seeing the "hiding" twin? Also they miscalculated by more than 2 weeks... Could this show my babies arent growing properly?