Thank you so much for sharing your concern, it's really thoughtful of you to look out for other mummies. From what I've gathered talking to people, the main worry isn't usually that the doppler itself causes harm, but more the practical side, it's actually quite tricky to find baby's heartbeat at home, especially early on, and some mums have accidentally picked up their own heartbeat instead, which can cause unnecessary panic when they think something's wrong. Someone in my mum group mentioned she kept trying to use hers and ended up more stressed rather than reassured. Your doctor's point about not using it too long also makes sense, since we want to be cautious. I think the safest approach is to rely on your regular scans and checkups where the professionals can properly assess baby's development, and save the doppler listening for those occasions, it's all about being sensible with how we use these tools. Definitely worth discussing with your own doctor or specialist about what's best for your pregnancy, since every situation is a bit different. Take care of yourself!