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When Am I Due?
Calculating Baby's Arrival Date
By iParenting Staff
You're 1 month pregnant!
The 280-days rule is based on 266 days of gestation (length of actual typical pregnancy, from conception to birth), plus the previous two weeks – from the first day of the last menstrual period until conception, for a total of 280 days.
The notion that there are exactly 14 days after LMP and before conception, however, is not accurate for everyone. If your cycle is typically 31 days, and conception occurs 14 days before your next period is due (not simply 14 days after your last period), there remains a three day discrepancy (31-14-14 = 3). In this case, that could mean that you might expect your child's arrival three days later and still your baby would be be right on time. The same holds true if your cycles are shorter - you might deliver sooner.
If your cycles are longer or shorter than 28 days, make sure to let your healthcare provider know. While she or he may not adjust your EDD, it's a good thing to keep in mind if the fetal heartbeat is not heard quite as early as expected or if you go post-dates (overdue).
Other ways to verify your baby's gestational age and your due date – with absolutely no guarantees here, either – include:
- Working out your date of conception based upon BBT, cervical mucus, timing of intercourse
- Remembering when you first got a positive pregnancy urine test. (In ideal circumstances, and using first morning urine with the strongest concentration of hCG, these home tests can be positive as early as 10 days after conception. It's usually more accurate to wait until at least the day your period is due before testing to lessen the chances of a false negative.)
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