Glad you managed to find it @Whymustyoubringinthebirds.
The in between scan weeks/months are the hardest!!
I also bought a doppler a while back (against everyone's advise) and then spent the whole weekend in tears and close to having a nervous breakdown as I couldn't find the heartbeat.
Luckily when I went for my scan a few days later, they found it straight away. They advised me how difficult they are for an untrained person to use properly, and also that I had a tilted womb so it was unlikely that even a trained midwife would have been able to find it at that stage with a doppler.
The Midwifes in my area do not even listen for a heartbeat at 16w anymore, due to not wanting to panic people if a heartbeat isn't found straight away.
Sonographer at my scan told me to go home, and throw it away. I told her not to worry, it was already smashed to pieces from where I threw it at the wall. Ha ha.
If you are lucky and can find the heartbeat, they must be such a lovely thing to have. But I would never attempt to use one again,
My friend had bought one, and sent it back to the shop without even opening it after seeing how much distress it caused me.
I finally feel that I may have turned the corner, and actually be starting to enjoy this pregnancy. Tiredness no longer seems as bad, skin is improving, sickness has gone and my hair is not so greasy. I never thought I was going to get this point!! I wouldn't go as far to say that I am glowing, but it is a definite improvement!!