To have an early u/s and see one baby and have the 20wk and see 1 baby but hear 2 heartbeats?
I was listening for the baby's heartbeat this am and I put tge doppler ( sonoline b) in a different spot than usual and right away I hear a heartbeat not mine or the placenta .. Then I moved it to where I usually find it and there it is again like 4-6 beats faster but same tone .. Freaked me out!!
I was on fb and in a mom forum and saw a mom not know she was pregnant with twins until 32 wks 0.o
Now I'm curious as to if you can hear 2 heartbeats in 2 different locations ?!!!
it could be anything. It could be the bloodflow to the placenta, that sounds just like a heartbeat. it could just be an echo. it could be yours.
It would be extremely hard to miss a second baby at the 20 week U/S. They're a pretty good size by then. I know it's possible and even likely to miss seeing a second sac at a 6 week dating U/S though.
Could be depending on the angle. And baby's heart rate goes up and down all the time.