Are you pregnant for the first time? You may be eligible for a research study. Researchers at the University of Pittsburgh are conducting a study to examine how blood vessels change during pregnancy. This information may help scientists understand why some pregnant women have complications like preterm birth and preeclampsia. This study requires up to four visits and participants will receive noninvasive ultrasound scans to measure the health of their carotid arteries. Participants will be compensated. For more information: Nancy Niemczyk, CNM, MSN 412-624-3350 or nan37@pitt.edu.