Wondering where your twin heartbeats were/are located with doppler. Are they on each side or top and bottom? Sono shows only 1 for us but doppler we are getting two heartbeats on each side. One is around 145 the other 150.. We have been chasing two heartbeats for weeks now.. I show every sign of twins except for the sono. I guess I'm more curious now where heartbeats would be for twins @31 weeks.