I think the point about the Doppler is that unfortunately, although it is of some reassurance, if something were to be wrong with bubba, God forbid, the heartbeat is the last thing to go. However, I can understand both sides! At 19 weeks, a Doppler might help you to calm down and feel better, relax and then have the time and concentration to sit down and feel baby move.
I do think it's true though, that even at 19 weeks, go with your instinct and see someone if you're not happy.
At this stage, they can't monitor you as such, but they will use a Doppler themselves to find heartbeat and check that they can't hear anything untowards. They are trained and can interpret anything that they hear.
I use a Doppler occasionally to calm myself down (as I have anxiety) but I know that I can't interpret the heartbeat properly
I have been into Day Assessment Unit twice for reduced movements and neither time have I used Doppler. I have just rung in and been seen.
It's so hard when you're less than 28 weeks. My experience was that I got really worried once I started having quieter days from 20 weeks which was when I knew that what I felt was baby moving. I think it was just baby having tired days and things, but it didn't stop me going to be seen by MW at this stage and once past 27 weeks, by DAU.
The point is, if you're not happy, be seen. My DAU have been stunning and when I said, I am so sorry to come in again and waste your time, they said, that is what we are here for. They asked if I felt better at the end (when the little whatsit had kicked the monitors to buggary and moved from breech to head up to breech again!) and when I said yes, they said, well you have not wasted our time at all then.
Mothers' instincts are powerful. Don't think you're wasting time.
Personally, I believe that the message with dopplers is, use them to feel more relaxed, but don't use them as a self diagnostic tool. The professionals (hopefully!) know best.
And, if you're fobbed off, don't be. Fight, cry(!), beg to be seen if you're not happy.
Good luck!
P.S. This is not me trying to be an expert, just trying to explain my experiences and to give 'another' view