When baby is cooperating perfectly, back facing my belly, and I have the doppler right on the heartbeat it sounds exactly like a galloping horse. If baby is positioned arms and legs facing belly, or I can't quite get on top of the heartbeat, the heartbeat sounds a bit like a chugging train or just a very fast thumping. Same with my son. As for heart rate= gender my son had a heartbeat of over 135 always, usually 145 when he was inactive. This baby has had a fast heartbeat of around 166 when inactive, now in second tri heartbeat has slowed to sometimes mid and high 150's when asleep or inactive, 158-170 when awake(sometimes as high as low 180's when really busy).
Where as wives tales on how to tell gender are fun, I don't put any faith in them at all. With my son I had ALL girl signs, everyone said girl, but we most definitely have a boy here and I was not surprised. (carried high and round, had acne, heart rate over 135, sounded like a galloping horse, SO MUCH morning sickness)
This baby I have boy signs:
Carrying low
very little morning sickness(no vomiting)
Girl signs:
Fast heartbeat that sounds like a galloping horse
Acne
Pseudo science ways to tell for this pregnancy:
Baby hangs out on the left side of the uterus(girl- My son DID like the right side which apparently says boy)
Round skull(Girl, but my son had a round skull too!)
(I do put faith in nub guesses but I didn't get a good view)
(Rebecca, I've heard sometimes you can pick up the heartbeat in the head as well as the chest, thus two different locations. I find the placenta echo and the placenta itself sounds very different from the heartbeat, but possibly the echo of your arteries?)