I am pregnant with my rainbow baby after a m/c in October. Having to wait a whole month in-between appointments is enough to drive you mad. So, I bought the sweetie song pocket fetal Doppler from Walmart. It was $50 after tax. It took about 4 days to come in! The little bottle of ultrasound gel isn't enough for many uses so I bought a $6 big bottle of it. They came in together. I LOVE IT. I read so many reviews saying it took them a long time to find the heartbeat and that it's completely normal if you can't find it. I was 10w3d when I used it for the first time. I found the heartbeat within five minutes and have used it every night since I got it. I know where my baby is now so it doesn't take me long at all to find it! I'm 11 weeks today and it's the reassurance I needed. I watched a few YouTube videos to know what I was looking out for and they really helped!