M.W.
Kathy has given you good advice. The frequency of early us's (and even midwives using dopplers) scares me. I never even try to find a heartbeat until 20 wks, and never use a doppler until active labor! Kathy is right, the fetus does not like us waves, (which is what those home dopplers use) they try to get away! It has not been proven but remains a possibility that US use may be linked to the rise in autism, and other learning disabilities, depending on what part of the brain gets zapped with te most US waves, so why take a chance? The home dopplers are weak, which minimises risk, but as many moms have already said, they don't work all that well either.
While we're talking about home dopplers, I want to caution that some women who work in the health care field, such as a hospital or drs office, where dopplers are lying around, are tempted to take a listen once in a while. There are fetal dopplers & vascular dopplers. The vascular dopplers have higher megahertz (sp?) which increasses the potential hazard to the fetus, so stick with fetal dopplers that have no greater than 2 or 3 megahertz. Most dopplers say right on them somewhere how many megahertz they are, some have interchangable probes too for multiple uses.
M., CPM