Question: how many weeks do you have to be to hear a heartbeat on a doppler?
Answer: Most women now get an ultrasound before 12 weeks. A fetal Doppler test normally takes place during your second trimester (weeks 13 to 28 of pregnancy). Some manufacturers of at-home fetal Dopplers say you may be able to hear your baby's heartbeat as early as 8-12 weeks of pregnancy.