Translabial Tridimensional Ultrasound Imaging of Uterine Cervical Dilatation in First Stage of Labor

This study is looking at whether an ultrasound scan from outside the body (translabial 3D ultrasound) can reliably measure how far the cervix has opened during labor — without needing an internal vaginal examination. Pregnant women admitted to the delivery room will have hourly ultrasound scans, and the results will be compared with standard internal examinations performed by the midwife or doctor. You may be eligible if: - You are a pregnant woman at 37 weeks or more (full term) - You are admitted to the delivery room in active labor - You have a single baby in the head-down position - You agree to participate and sign informed consent You may NOT be eligible if: - You are less than 37 weeks pregnant (preterm) - You are carrying twins or more - Your baby is not in the head-down position - You develop complications such as abnormal fetal heart rate, bleeding, pre-eclampsia, or need for emergency intervention Talk to your doctor about whether this trial might be right for you.