Just had my 1st ultrasound at 11w6d for the sequential screen. Baby is looking good and healthy. Found out there is a 2nd sac that was most likely a twin who didn't survive. I'm not quite sure what to think about that. They said it will get re-absorbed by the body naturally but they can't do blood tests because of the chance of a false positive from the twin. Anyone have any experience or insight about this? Just wondering what to expect or what to be concerned about.