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The most credible source of information on when to expect your baby is your physician. The assumed duration of pregnancy is usually 280 days from the first day of the last menstrual period. You can use the following calculation method to estimate your date of delivery: Step 1: Determine the first day of your last menstrual period. Step 2: Add seven days to your answer in Step 1. Step 3: Count back three months to your answer in Step 2. This method, however, is only to estimate. First time pregnancies, especially, are usually ahead or behind schedule by at least two weeks. Next is an easy-to-use gestational table which will guide you when to expect yout baby. Use the light colored numbers in determining the first day of your last menstrual period. Then use the dark colored number below it as your estimated date of birth.