Ladies you are probably not going to believe this but I found bubbas heartbeat on my sonoline b doppler earlier. I'm 7+4 and it was 136 bpm. I know it was the heartbeat as i used it when i was pregnant with my little girl from 9 weeks as i am a real worrier. (And yes i know i know they can cause more worry if you cant find the heartbeat) the only reason i tried this early is because there was videos on you tube of people finding it in the 8th week. Xx