It can also work as a pregnancy week calculator, giving you an estimated week of pregnancy and the first day of your last period. You don't have to do the calculations by hand! Just put the numbers into our conception date calculator based on the due date. Now, she has one question: 'what day did I conceive?'.ġ9th September 2019 - 266 days = 26th January 2019 She just came back from the doctor, who told her that the due date is on 19 September 2019. However, instead of all this counting, she used our pregnancy conception calculator. She conceived around her ovulation date (as a woman's egg can last up to 24 hours), on 28 June 2018. As mentioned before, we can assume that her ovulation began around 17 days after her LMP, on 28 June 2018.ġ1th June 2018 + 17 days = 28th June 2018 The first day of her last period (LMP) was 11 June 2018, and typically, her cycle lasts for 31 days (still in range, between 21-35). She is 11 weeks pregnant, and still doesn't know her conception day. LMP + cycle length - 14 = conception date Therefore, the formula to estimate the conception date based on the LMP: Therefore, conception day is the day of ovulation and might last for 24 hours after the egg is release. Although sperm can survive up to 7 days inside a woman's body, conception does not happen until ovulation. It means, to get pregnant, you should have intercourse within this time. When does conception happen? How long does conception take? The fertile window begins 3-5 days before the ovulation date, and ends one day after it.

If you're not sure how long your cycles are, leave the default number of 28 days. For cycles longer than 35 days or shorter than 21 days, these calculations are not applicable and you should consult by a doctor. If it's longer, you add some days, e.g., for a 34 day cycle - ovulation is on the 20th day. If it's shorter, you subtract the corresponding number, e.g., for a 22 days cycle - ovulation occurs on the 8th day. So, if a cycle lasts 28 days, ovulation occurs the 14th day after the first day of the cycle (first day of bleeding). In cycles of 28 days, ovulation happens around 14 days before the beginning of the next cycle. However, typical values range between 21 and 35 days. The majority of cycles last around 28 days. The other method of using the pregnancy conception calculator is to provide the first day of your last menstruation (LMP) and the average length of your menstrual cycle. Let's go back to the question: what day did I conceive? In our conception calculator, we subtract 266 days from the estimated due date and get the most probable day of conception: But don't worry if the due date changes or you go in labor on a different date - only 4% of babies are born on their due date and 80% are born either two weeks before and after the date. If a baby is born before week 37, it's called a premature birth. That is 266 days from the conception date.

Pregnancy typically lasts around 40 weeks (counted from the first day of your last period). Remember that those dates, as well as conception calendar, are only an estimation and may change during the next visit. Although the doctor can see the baby from the 5-6th week of pregnancy, the best time to go for the first sonography is between week 8 and 12.īased on the characteristics of the image and the results of your blood test, the due date and week of pregnancy can be determined. When you visit the doctor they will most likely perform an ultrasound. The first way is to provide the birth due date. So, what day did I conceive? There are two ways to use our conception calendar calculator.

Add date calculator