How the WebMD Pregnancy Calculator Works At its core, the calculator uses a straightforward method to project your pregnancy timeline. By inputting the first day of your last menstrual period, the tool applies the standard Naegele's rule, which adds 280 days or 40 weeks to that date.
WebMD Pregnancy Week by Week: Your Guide to Fetal Development and Tracking
Ovulation Consideration Adjusts for variations in cycle length to improve accuracy. This resource leverages the standard medical calculation based on the first day of your last menstrual period to offer a reliable estimate that you can discuss with confidence during prenatal visits.
Your obstetrician or midwife will refine these estimates based on ultrasound measurements and your personal health history. The calculator serves as a starting point for conversation, ensuring that you enter each prenatal appointment with informed questions and a clear understanding of your progress.
WebMD Pregnancy Week by Week: Your Guide to Fetal Development and Milestones
Navigating Variability and Accuracy Pregnancy dating can be complex, particularly for individuals with irregular cycles. Ultrasound Adjustment May be used to verify dates if early ultrasound data is available.
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