I said Id never get one of these but bought one at 12 weeks and its the best thing I ever ever did. Angel Sounds are the best ones this early on, most of the others you cant hear anything till later on or theyre just plain rubbish.
Pop some gel on or baby lotion. Lay flat, relax and place the doppler very very low centrally near your pubic bone/just above. Press quite hard and gently move the doppler around. A whooshing sound like wind through trees which is quite clear is the placenta. If you go too far left or right you will pick up your own heartbeat from the femoral artery. Youre listening for a train type noise wooosh wooosh wooosh (lol) the further along you get the clearer it will get and you will clearly hear the heart bumping.
I found it every time easily. I listened to my own heart with the doppler first and you tube is great because it helps you know what youre listening for.
Good luck XX