You should definitely be able to hear it on your next appointment. I'm going on 10w and at my last visit I was told future visit would be with the doppler. Good Luck
They say you can usually start hearing it with a doppler at 10-13 weeks. If you are 14 weeks than you should be able to hear it. However if you dont hear it dont be too worried it may still just be too early.
I think its around like 8 weeks. Don't quote me on that though. You should be able to hear it wednesday. Congrats on the pregnancy. :)