Dr. Sarah Chen

Dr. Sarah Chen is a board-certified obstetrician-gynecologist who has spent fourteen years in clinical practice, splitting her time between prenatal care, labor and delivery, and a busy outpatient clinic. She completed her residency in obstetrics and gynecology and has since cared for thousands of pregnancies from the first positive test through delivery and postpartum recovery. Her day-to-day work centers on pregnancy dating, ultrasound interpretation, and counseling expecting parents on what to expect at each stage.

Dr. Chen reviews the core pregnancy-dating and due-date tools on this site (the pregnancy calendar, due date calculator, conception calculator, gestational age calculator, and the week-by-week development guides). She checks every calculator against the dating methods she uses in clinic, including LMP-based estimates, conception-based dating, and ultrasound adjustments, and flags any tool that returns a value she would not put in a patient's chart.