Health library

Reviewed 02/10/2026

Sources

• American College of Obstetricians and Gynecologists. "FAQs: A Partner's Guide to Pregnancy." https://www.acog.org/womens-health/faqs/a-partners-guide-to-pregnancy.
• American College of Obstetricians and Gynecologists. "FAQs: How Your Fetus Grows During Pregnancy." https://www.acog.org/womens-health/faqs/how-your-fetus-grows-during-pregnancy.
• American Pregnancy Association. "Fetal Development: First Trimester." https://americanpregnancy.org/healthy-pregnancy/pregnancy-health-wellness/first-trimester-of-pregnancy/.
• March of Dimes. "Calculating Your Due Date." https://www.marchofdimes.org/calculating-your-due-date.
• UpToDate. "Calculator: Estimated date of delivery (EDD)." https://www.uptodate.com/contents/calculator-estimated-date-of-delivery-edd-patient-education.
• UpToDate. "Pregnancy Due Date Calculator (Beyond the Basics)." https://www.uptodate.com/contents/pregnancy-due-date-calculator-beyond-the-basics.