I agree Emby, I am 23 weeks and still feel anxious about things continuing well. I hoped that making it past the 20 weeks scan would be a good hurdle, and it was for a few days but now I am paranoid about pre term labor and stuff! I am not sure it will ever be easy to relax until he is here, healthy in my arms - and then I get to worry about a whole new bunch of things! ha ha
The at home dopplers are great. I couldn't hear my baby until about 12 weeks, and I did have a few times early on when I couldn't find the heartbeat first try. It was often low down in my pelvis not up in the swollen belly I thought it should be. At the beginning it can take a while to find it, and distinguish it from your own heartbeat. However, I would not have survived without it in those early weeks. I think mine cost about $50 but it was well worth the investment. Now I am lending it to a friend who is 10 weeks and having some spotting. She needs the reassurance more than me now our little guy is kicking so much.
Wishing you all the very best xx