We were both right.
It was definitely her heartbeat, without a doubt!
But I've checked my dates and I was 14 weeks, not 10 🤦 I was 10 weeks at Christmas with my second not my first
Differentiating between the different noises becomes quite simple, and a pulse check, to establish your own heart rate, and exclude it helps. Then obviously you've got placental sounds etc, but they sound quite different from heart rate.
I don't think it's so much it cant be found early, but it can't reliably be found early - its hit and miss. Which means for fun, its great. For reassurance, its terrible. As the OP is a self confessed serial tester, and wants reassurance after IVF, its a terrible idea.
You really do need to be able to put it to the back of your mind, bot worry, and get on with your day, if you dont get lucky on that day, and I think for some people that is possible, for others its not. I don't think they should be named just because some people use them irresponsibility as reassurance rather then getting medical care though.