Home Doppler?

I'm currently 16 weeks pregnant and after experiencing a rough first 12 weeks, I've been feeling much more human over the past couple of weeks! However, I've found this comes with a new problem of worrying that everything is going as it should be! My little bump seems to have stopped growing and I hate the long waits between scans to see if everything is okay. I'm just worrying all the time so was wondering if anyone has used a home Doppler and which one you would recommend? I've looked online but they have so many mixed reviews it's hard to know which one to go for ... ? Thanks!