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There are many different online and natural methods for determining a woman's most fertile time of the month. From the point of conception to delivery, the average is 38 weeks or 266 days. Predicting a woman's due date based on the date of conception is the best and most accurate way in which to predict a due date for delivery. A woman's due date is generally calculated using the conception date, which is the most accurate method, however in most cases a woman cannot accurately predict the date with total certainty. Because of this, a due date is commonly calculated using the first day of the last menstrual period (LMP). In most cases, a physician will add an additional 2 weeks, which results in a total of 40 weeks or 280 days.

The reason for adding an additional 14 days to the estimation is because of the fact that most conceptions occur on day 14 of a menstrual cycle, based on a 28-day lapse. Calculating a due date from a woman's last menstrual cycle is not an exact science because of ovulation variation. These factors also vary because each woman's menstrual period will vary and some women could actually ovulate more than once a month, or even earlier or later. Some women will use an ovulation prediction kit or do basal body temperature charting. Calculating a due date from ovulation is consistently more accurate and is much easier than trying to guess based upon estimates from the last menstrual period. Calculating a precise ovulation date is never an easy thing to do because of many different issues. A woman can have irregular menstrual cycles, sporadic ovulation, or medical conditions and stress which will interfere with an accurate pinpointing of an average pattern of ovulation.

There is no tried and true method which will provide 100% accuracy in the prediction of a woman's due date, but tracking monthly menstrual cycles and noting any irregularities can eliminate some of the guesswork. An online due date ovulation calendar can be a very helpful way in which a woman can predict with a fair rate of certainty when her developing infant was conceived. For those searching for more accurate information as to a due date ovulation calendar, there are websites which will provide a good starting point. By making note of the last menstrual cycle and plugging in the average length of a period, a woman can get a very good idea of when she can expect to welcome her little bundle of joy into the world.

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