It is generally not possible for expectant mothers to hear their baby's heartbeat on their own during the first three months of pregnancy. At this stage, the fetus is still very small, and its heartbeat may not be strong enough to be audible without medical equipment. However, healthcare professionals can use a Doppler device or perform an ultrasound to listen to the baby's heartbeat. These methods are safe and commonly used during prenatal check-ups. If you are concerned about not being able to hear your baby's heartbeat, it is best to consult with your healthcare provider who can provide reassurance and monitor your pregnancy progress.