There is a good chance that what your hearing is your own pulse, probably coming from the placenta. I would stop taking the Percocet until you see your doctor and find out if it's safe to take during pregnancy. In the mean time, when you think you've found baby's heartbeat, and it seems low, search around more to see if you can pick up another one...a faster one. It probably would still be fairly low in your pelvis (maybe about half way between your pubic bone and belly button) and usually off to one side. Don't panic though, even at 18 weeks the doctors may have some trouble trying to track down your little one!! Good luck! :)
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