Sonoline B Fetal Doppler; 3Mhz?

I don't have that one, but I have a pretty expensive 3MhZ one and I couldn't hear my baby's heartbeat until about 16 weeks with it and not even consistently then, it was about 18 weeks or so before I could find it everytime.....its really tricky to do it at home sometimes though, so don't let it freak you out!!! I do love mine, but if you are a major worrier I wouldn't advise trying it until at least 12 weeks that's when most doctors wait to listen also to be sure you get to hear it!!!! Best wishes and congrats!!!