The invention relates to a method of monitoring a fetal heart rate, the method comprising: providing a first measurement head (104) and a second measurement head (106) and a sensor (200), the sensor (200) being comprised in the first measurement head (104) or the second measurement head (106), the sensor (200) being adapted to sense the maternal heart rate, the first measurement head (104) being adapted to sense maternal-fetal related medical data and the second measurement head (106) being adapted to sense the fetal heart rate, measuring the maternal heart rate by acquiring maternal heart rate data using the sensor (200), measuring the fetal heart rate by acquiring fetal heart rate data using the second measurement head (106), acquiring the maternal-fetal related medical data, detecting maternal-fetal heart rate coincidences by analyzing the maternal heart rate data and the fetal heart rate data.