Health Calculators

Pregnancy Fertilization Calculator

This tool will calculate an estimate of the fertilization date based on the due date.

Pregnancy fertilization Calculator

Calculator Based on:
Most probable pregnancy fertilization dates:

Table of contents

When did I conceive?
Pregnancy symptoms
Due date
Estimated due date

When did I conceive?

It is challenging to know the exact date of conception. It is difficult to determine when conception took place because sperm can survive in a woman's body for up to five consecutive days. It is not art.
Women can conceive anywhere between 11 and 21 days after their last period. The timing of ovulation can vary from one person to the next. Due dates are determined from the first day of the previous period, not the date of conception.
Although it can be confusing, this method has been accepted as a standard for measuring pregnancy and calculating the due date. The due date is usually set at 40 weeks from the day the woman has her last period.

Pregnancy symptoms

These are some of the most apparent signs and symptoms that may indicate pregnancy early on:
Missed period: You might be pregnant if you are in your childbearing year and have not had a regular menstrual cycle for at least a week. If you have irregular menstrual cycles, this can be misleading.
Tender, swelling breasts: Pregnancy hormonal changes can make your breasts more sensitive and sore. As your body adjusts to hormonal changes, the discomfort will likely diminish over time.
Nausea, with or without vomiting: Morning sickness can happen at any hour of the day or night. It usually starts one to two months after becoming pregnant. Some women experience nausea sooner than others, while some suffer from it never. Although it is not clear what causes nausea during pregnancy, hormones in pregnancy may play a part.
More frequent urination: Your body's blood volume increases during pregnancy. This causes your kidneys and bladder to filter more fluid.
Fatigue: Frustration is also a common sign of early pregnancy. It is not known what causes sleepiness in the first trimester. Fatigue could be caused by a rapid increase in progesterone levels during the first trimester.
You might also experience other signs and symptoms during your first trimester, such as:
Moodiness: Early pregnancy hormones can cause you to feel emotional and even weepy. Also, mood swings are pretty standard.
Bloating: Early pregnancy hormone changes can make you feel bloated. This is similar to what you feel when you start your period.
Light spots: Light spots could be a sign of pregnancy. It is also known as implantation bleeding. This happens when the fertilized egg attaches to the lining of your uterus. This usually occurs between 10 and 14 days after conception. Implantation bleeding occurs around the same time as a period. It is not common for all women to experience it.
Cramping: Some pregnant women may experience mild uterine cramping during early pregnancy.
Constipation: The effects of hormonal changes can cause your digestive system to slow down, leading to constipation.
Food aversions: You might notice a change in your sense of taste and smell when you become pregnant. Like many other signs of pregnancy, these food preferences can be attributed to hormonal changes.
Nasal congestion: An increase in hormone levels and blood pressure can cause your nasal mucous membranes to swell, dry, and bleed easily. You might experience a stuffy, runny nose.
These symptoms and signs aren't just for pregnant women. These symptoms can show that you are getting sick or that your period may soon begin. You can also be pregnant even if you don't experience many of these symptoms.
If you have missed a period or noticed any of the symptoms above, it is a good idea to take a home pregnancy test. Your health care provider should be contacted if your home pregnancy test comes back positive. Prenatal care can be started as soon as your pregnancy is confirmed.

Due date

The estimated 5% born on the due day of birth is only a tiny fraction. Each baby and each mother are different with their birth schedules. We can only provide a general guideline for what they can expect.
The date of conception may be considered the ovulation date because the human egg can fertilize for 12 to 24 hours after ovulation. The ultrasound date of ovulation can be determined with the same accuracy as the ultrasound estimate of the gestational year. Therefore, it is impossible to decide on the exact date of conception as in vitro fertilization.
Additionally, a woman may be more likely to get pregnant if she has had sex before ovulation. However, if she has sex for at least five days before ovulation, conception could also occur from live fertilized sperm.

Estimated due date

The estimated due day (also known as EDD, or EDC) is when labor spontaneously begins. Add 280 days (9 months and 7) to the first date of the last menstrual cycle (LMP) to calculate the due day. This is the method that the "pregnancy wheel" uses. The accuracy of this method's EDD is dependent on accurate recall from the mother. This assumes regular 28-day cycles and that conception and ovulation occur on day 14. LMP can overestimate the length of the pregnancy and may lead to errors of more than two weeks.
For cases in which the date and time of conception are known, such as when in vitro fertilization is used, the EDD can be calculated by adding 266 additional days to the date and time of conception.
Ultrasound uses the fetus's size to determine the gestational time (the amount of time since the last period). The accuracy of the ultrasound estimation of the gestational date varies depending on the gestational period. "Ultrasound measurements of the embryo and fetus during the first trimester (up to and including 13 6/7 week gestation) are the best method to establish or confirm the gestational ages." The Society of Obstetricians and Gynaecologists of Canada suggests that the earliest ultrasound should have a crown-rump length of seven weeks. (Or 10 mm).
The American College of Obstetricians and Gynecologists recommends that ultrasound-established dates should take preference over menstrual dates when the discrepancy between ultrasound dating and LMP is:
LMP, more significant than five days preceding 9 0/7 weeks gestation
Higher than 7 Days from 9 0/7weeks to 15 6/7weeks by LMP
Between 16 0/7 and 21 6/7 weeks, the difference in time is more significant than ten days by LMP
Higher than 14 Days from 22 0/7weeks to 27 6/7weeks by LMP
LMP, greater than 21 Days after 28 0/7 WEEK


An ultrasound can also give you an accurate estimate of when your baby will be due and how long it will take to get there. Ultrasounds are painless and straightforward medical procedures available at doctors' offices, OB/GYN Clinics, and other medical providers.
An ultrasound can help determine the gestational year. Ultrasounds can be most accurate between the 8th-18th week. Even women who don't have periods can use an ultrasound to determine how far their pregnancy is.

Parmis Kazemi
Article author
Parmis Kazemi
Parmis is a content creator who has a passion for writing and creating new things. She is also highly interested in tech and enjoys learning new things.

Pregnancy Fertilization Calculator English
Published: Thu Mar 10 2022
In category Health calculators
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