So, I have posted on a few threads in the last week or two since discovering I was pregnant with v unexpected 3rd child. Been for an early scan today and she can see one happily beating little heart but also thinks there may be another one behind (currently without a beating heart). They would apparently be identical if there are 2. Does anyone have any experience of discovering they were having twins and finding one with a heartbeat and one without. She said if it is a twin the heartbeat can start later than the other one. I am only 6 weeks so apparently already early to have one heartbeat. I am soooo shocked and now have to wait til 20th for another scan!