Most pregnancies last around 40 weeks or 38 weeks from conception , so typically the best way to estimate your due date is to count 40 weeks, or days, from the first day of your last menstrual period LMP. Another way to do it is to subtract three months from the first day of your last period and add seven days. So if your last period started on April 11, you'd count back three months to January 11 and then add seven days, which means your due date would be January Calculating your due date based on the first day of your last period works well for women who have a relatively regular menstrual cycle. But if your cycle is irregular, the LMP method may not work for you. Because a reliable estimated date of delivery EDD is important, you and your practitioner can use your conception date instead if you remember it.
Using Pregnancy Dating After a Miscarriage or Pregnancy Loss
Pregnancy due date calculator - NHS
Because the human egg is capable of fertilization for only 12 to 24 hours after ovulation the date of ovulation may be taken as being the date of conception. However, ultrasound determination of the date of ovulation has the same imprecision as does the ultrasound estimate of the gestational age and, therefore, a precise date of conception cannot usually be determined as with in vitro fertilization. In addition, although a woman is most likely to become pregnant if she has sex on the day of ovulation conception may also occur from live sperm still in her reproductive tract on the day of ovulation if she had sex for up to five days before ovulation [26,27]. The due date may be estimated by adding days 9 months and 7 days to the first day of the last menstrual period LMP. This is the method used by "pregnancy wheels". The accuracy of the EDD derived by this method depends on accurate recall by the mother, assumes regular 28 day cycles, and that ovulation and conception occurs on day 14 of the cycle.
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Your Guide to Dating While Pregnant
Read on to learn more about what you can expect to happen with you and your baby-to-be every week of your pregnancy, since each one brings new developments and milestones when you're expecting. Your baby's changing day by day, and your body is keeping pace. Find out what's going on and why, inside and out, with this week-by-week pregnancy calendar guide.
Due date is the estimated date of delivery calculated by two methods, using last menstrual period and other one is using conception date. Conception Date Method: This method is based upon the date you conceive a child, for which woman need to keep track of ovulation date and estimate the date of conception. Using this method due date is 38 weeks from the conception date.