Some women prefer calculating their pregnancy weeks from the day of ovulation.

If you have a 28-day menstrual cycle, and find out that you have not had your periods on the expected date, then you are considered four weeks pregnant. To know your pregnancy weeks with this calculation, remember the first day of your last period. Therefore, health professionals date the pregnancy considering the last menstrual period. There is no exact way to determine when you have ovulated and conceived. Your due date is estimated by adding 280 days (i.e., nine months and seven days) to the first day of your LMP. What Is An EDD (Estimated Due Date)?Īn estimated due date (EDD) is the best guess for a spontaneous onset of labor. As most of us do not know the date of conception, it is taken as an estimate based on the LMP method. If you have a 28 day-cycle, conception is known to occur between 11 and 21 days after the first day of your LMP. For instance, if you had intercourse on the 5th of the month, and you did not ovulate until the 8th of the month, the conception will occur on or just after the 8th. What Is The Date Of Conception?Ĭonception occurs after ovulation, when the sperm meets the egg. In cases of in-vitro fertilization, the date of conception would be precise. In short, there is only a six-day fertile window where you can get pregnant. The sperm can live up to five days, and the ovum for up to 24 hours after being released. But, the calculations can go wrong as you may not conceive on the same day of the intercourse. Only a few women can accurately track the ovulation days and can guess when they have conceived. The estimated due date, in this case, will be 38 weeks (266 days) from the date of conception. If you are keeping a track on your ovulation and know the fertilization date, you can estimate the due date based on the date of conception. How Do You Estimate Baby Due Date Using Conception Date Calculator? If you are delivering your baby on the due date, your baby will be 38 weeks, and not 40. The menstrual period and ovulation are the first two weeks of pregnancy. The due date is calculated by adding 280 days, i.e., 40 weeks to the first day of your last period (if it is a 28-day cycle). You can calculate the due date by entering the first day of your last menstrual period and the average length of your cycle in the pregnancy calculator. It gives an approximate date helping you to prepare for the big day. Pregnancy calculator determines the date of your baby's birth. What is Pregnancy Calculator And How It Calculate Your Due Date? The actual delivery date may be the same or different due to many other factors related to pregnancy. This is your estimated date of delivery (in blue text).It is difficult to track conception date and this is why LMP method could be more suitable to calculate the estimated due date. You may also estimate your delivery date by using the steps 1 and 2 and the chart:įirst, locate the first day of your last menstrual period (in black text). Therefore, dates may have to be adjusted for longer or shorter menstrual cycles. This 3-step method is referred to as Naegele's Rule and is based on a normal 28-day menstrual cycle. Adding 1 year and 7 days would bring you to June 16, 2011, as your estimated due date. Counting back 3 calendar months would be June 9, 2010. Lastly, add 1 year and 7 days to that date.įor example: Your last menstrual period began on September 9, 2010. Next, count back 3 calendar months from that date. An estimated due date can be calculated by following steps 1 through 3:įirst, determine the first day of your last menstrual period. A typical pregnancy lasts, on average, 280 days, or 40 weeks-starting with the first day of the last normal menstrual period as day 1.

Conceived date calculator