It is not uncommon for doctors to have difficulty hearing the baby's heartbeat during the first prenatal visit, especially at 11 weeks. The position of the uterus and the size of the baby can make it challenging to detect the heartbeat using a Doppler device. In such cases, doctors may opt for an ultrasound to confirm the presence of a healthy pregnancy. While it can be concerning not to hear a heartbeat initially, it does not necessarily indicate a problem with your pregnancy. Every woman's body is different, and factors like weight, positioning of the uterus, and fetal movement can affect how easily the heartbeat can be detected. If you are worried or have any other symptoms, it is important to communicate with your healthcare provider who will guide you on further steps or recommend additional tests if needed.