By adding 11 to 21 days, you can calculate that the conception date would have been between the 14th and 24th of February. This means her last period started on February 3. Once you know the first day of your last period, you can add 11 to 21 days to figure out your conception date.įor example, a woman who is due on November 10 can calculate the first day of her last period by subtracting 40 weeks. Therefore, if you have your due date, you can subtract 40 weeks from this date to determine your last menstrual period. Track ovulation, period and more Open tool. Learn when you can expect your little one to arrive. When a mature egg is released, your BBT tends to increase by approximately one degree. Take the guesswork out of pregnancy with our pregnancy & ovulation tools that will help you know your most fertile days and estimate your babys due date. And you can also check your basal body temperature (BBT). Generally, the due date is calculated 40 weeks after your last period. For one thing, you can use an ovulation calculator program to tell you the probable date of your egg-drop, which is especially useful if your menstrual cycle doesnt conform to the 28-day norm. By knowing your estimated due date, you can calculate when your last period started, and from there, you can calculate your conception date. It is especially used by women who do not remember when their last period was, and for women who have irregular periods. This method is similar to calculating your conception date using your last period. Therefore, if you know the first day of period, you can add 11 to 21 days to this day to have an idea of when conception occurred.įor example, if you are pregnant and your last period started on March 5, that means you likely conceived between March 16 and 26. For women with a 28-day cycle, conception generally occurs between 11 and 21 days after the first day of your last period.
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