## Pregnancy due date

• In order to calculate your approximate due date, answer the following questions:
• What was the first day of your last menstrual period (first day of bleeding)
• What is your average cycle length (from first day of your period to the first day of your next period)?
• Estimated fertility window: First day of last menstrual period + 10 days through first day of last menstrual period + 20 days. So, if your period started on May 1, then your fertility window would be: May 11 through May 21
• Estimated conception date: First day of last menstrual period + 15 days. So, if your period started on May 1, then your estimated conception date would be: May 16
• Estimated gestational age: First day of last menstrual period + elapsed days. So, if your period started on May 1, and today's date is July 1, then your estimated gestational age (how far along in your pregnancy) is approximately 8 weeks, 4 days (60 days).
• Estimated due date: First day of last menstrual period + 40 weeks. So, if your period started on May 1, your estimated due date would be February 5.