Hi guys, just thought you might appreciate my input (as a sonographer). The intensity of the ultrasound setting used 'to have a listen' to the heartbeat is one of the most powerful we can use when we are scanning. There is debate as to whether it does harm when bub is very small and the heart still developing. A lot of sonographers now won't take that chance and use another setting instead to measure the heartbeat. When I am scanning I would rather err on the side of caution for the sake of your baby and only use that setting after 12 weeks when the heart has developed. Without going into the physics of it (which we study for years to understand), sometimes you have to trust that the sonographer is doing things in your best interest and that of your baby. It is NICE to have a listen but not medically necessary and I explain the reason behind doing it to the people I scan and they are absolutely fine with it once they understand why we don't do it. Most sonographers would not do what they do just to be mean, like I said, trust that we are keeping up with the latest research and studies and doing things in the best interest of your baby. You may not understand a lot of what we do but we do it for a reason!!