how far along do u have to be to hear ur babys heartbeat on a doppler?

The audibility of a fetal heart with an office doppler depends upon the baby's location, the location of the placenta, your body-fat composition, the position of the uterus and the skill and patience of the provider.

The fetal heart

The Doppler instrument
After the 9th or 10th week after your last menstrual period, you might be able to hear your baby's heartbeat at your prenatal appointment. Your obstetrical practitioner probably uses a Doppler instrument for this purpose, which bounces harmless sound waves off the fetal heart. The way the sound comes back is affected by motion, so a beating heart creates a change in the sound that can be picked up by the receiver in the Doppler. Whether you actually hear the heartbeat at 9 or 10 weeks depends partly on luck-the instrument must be placed at just the right angle. It also depends on the position of your uterus, and if you're slim or heavy. By the 12th week, the heartbeat can usually be heard consistently, using the Doppler instrument for amplification.,1510,9851,00.html
Other Answer:
I believe I heard my kids heartbeat either the end of my 1st trimester or beginning of my 2nd trimester. It is the coolest thing you've ever heard. Good luck & congratulations!
you have to be at least 12 weeks

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