Pregnancy calendar in weeks of amenorrhea and gestation

Important dates in my pregnancy



Average length of your cycle

I am expecting...

I have...

Estimated date of pregnancy

Estimated date of delivery

Your maternity leave

Leave Date Duration
Beginning of the pathological leave if any 2 weeks
Start of pre-natal leave

End of post-natal leave

(excluding any pathological leave)

Your pregnancy timeline, week by week

Quarter Month Progress of the pregnancy (pregnancy week and amenorrhea week) Date of the week Details
1st trimester 1st month 1 OS - 3 SA

2 SG - 4 SA

3 SG - 5 SA

4 SG - 6 SA

2nd month 5 SG - 7 SA
1st prenatal examination before the end of the 3rd month
6 SG - 8 SA

7 SG - 9 SA

8 SG - 10 SA

3rd month 9 SG - 11 SA
1st ultrasound (dating) and trisomy screening
10 SG - 12 SA
1st ultrasound (dating) and trisomy screening
11 SG - 13 SA
1st ultrasound (dating) and trisomy screening
12 SG - 14 SA

13 SG - 15 SA

2nd trimester 4th month 14 SG - 16 SA
2nd prenatal consultation
15 SG - 17 SA

16 SG - 18 SA

17 SG - 19 SA

5th month 18 SG - 20 SA
3rd prenatal consultation
19 SG - 21 SA

20 SG - 22 SA
2nd ultrasound (morphological)
21 SG - 23 SA
2nd ultrasound (morphological)
22 SG - 24 SA
2nd ultrasound (morphological) and screening for gestational diabetes
6th month 23 SG - 25 SA
4th prenatal consultation and screening for gestational diabetes
24 SG - 26 SA
Screening for gestational diabetes
25 OS - 27 ADT
Screening for gestational diabetes
26 OS - 28 ADT
Screening for Gestational Diabetes
3rd trimester 7th month 27 SG - 28 SA
5th prenatal consultation and end of very premature birth
Start of birth preparation sessions
29 SG - 31 SA

3rd ultrasound and end of extreme prematurity
8th month 31 WEEKS - 33 WEEKS
6th prenatal consultation - 3rd ultrasound
3rd ultrasound
33 SG - 35 SA

34 SG - 36 SA
End of average prematurity
9th month 35 WEEKS - 37 WEEKS

36 SG - 38 SA
7th prenatal consultation
37 SG - 39 SA

38 SG - 40 SA

39 SG - 41 SA

Postpartum "Golden month 42 SA or 1 week postpartum
Overtime and induction if delivery has not occurred
2 weeks postpartum

3 weeks postpartum

4 weeks postpartum

2nd month postpartum 5 weeks postpartum

6 weeks postpartum
Post-natal consultation and beginning of perineal rehabilitation - The return from childbirth can take place as early as this date if you are not breastfeeding
7 weeks postpartum
Post-natal consultation and beginning of perineal rehabilitation
8 weeks post-delivery
Post-natal consultation and beginning of perineal rehabilitation


I print my pregnancy calendar

Download your personalized calendar in PDF format and print it to include in your maternity follow-up file.

You have been waiting for years, months, weeks, it may be a surprise for you but the test is positive: You are pregnant! Pregnancy is for many a time of great questioning, the upheaval of a life on the physical, psychological and emotional level.

Here is a pregnancy calendar that will help you to see a little more clearly during the next nine months.

How to use the Elia pregnancy calendar?

The Elia pregnancy calendar is very easy to use and will allow you to print and have in a blink of an eye a view on the weeks of your pregnancy, the trimesters, the main key dates but also to know more about your due date, your ultrasounds and to prepare yourself for the postpartum. Week after week, follow the evolution of your future child.

To do this, enter the date of your last menstrual period, the average length of your pregnancy, the number of children you have, and the number of months you will be pregnant. menstrual cyclethe number ofchildren you have already had or not. Our pregnancy calendar will allow you to know exactly the key dates of your pregnancy.

What are the important dates of pregnancy?

Pregnancy generally lasts 9 months for most women, 41 weeks of amenorrhea. Three intense trimesters with their share of surprises, transformations and expectations. Between the changes in your body and the evolution of the fetus, certain dates are important to know to ensure the proper development of your baby and medical care adapted to your needs and your health status.

Make a note of them now or download your pregnancy calendar so you always have them with you!

  • The date of your last menstrual period, the date of conception or the date of transfer or insemination for those who are in the MAP process;
  • The expected delivery date;
  • The ultrasound of the 1st trimester, the ultrasound of the 2nd trimester and the ultrasound of the 3rd trimester from your gynecologist;
  • Administratively: the declaration of pregnancy, the registration at the maternity hospital, the appointments with your midwife, the calculation of your maternity leave.

How to calculate your pregnancy calendar?

When you are told about your pregnancy, your gynecologist will probably talk about trimesters, weeks of amenorrhea and weeks of pregnancy. This is the difference betweenfetal age andgestational age.

The weeks of pregnancy

We speak in weeks of pregnancy when we talk about the real age of the future baby. In fact from the date of conception to the date of the day. The date of conception is defined at the time of the first ultrasound or earlier when the woman knows her ovulation date and the date on which she and her partner had intercourse. The pregnancy chart is also easier to calculate when the mother-to-be has used MAP.

The weeks of amenorrhea

The gestational age is calculated in weeks of amenorrhea. Pregnancy is calculated from the date of the last menstrual period until birth between 38 and 42 weeks. In general, the beginning of the pregnancy and the age of your fetus will be calculated two weeks after the beginning of your last menstrual period.

Calculating on the first day of your period

Calculating your pregnancy according to the first day of your period will be reliable as long as your cycle is a regular 28 days. Indeed, ovulation and the beginning of your last period will be considered as the first two weeks of the pregnancy. It is therefore not a 100% reliable method.

To calculate your due date with the first day of your last period, you must add 280 days. You will have a good estimate of your due date.

Naegele's rule

This rule is one of the most used to calculate the due date. To calculate your pregnancy calendar, we take into account the date of the 1st day of your last period, the length of your cycle between 20 and 45 days and we add 280! On average a cycle lasts 28 days, ovulation takes place 14 days after the beginning of the cycle. If your cycle is shorter, the due date will be estimated earlier, if your cycle is longer, the due date will be later.

Mittendorf and William's rule

The Mittendorf and William rule is more comprehensive than the Naegele rule. We use it to create our algorithm and our pregnancy calendar application. Indeed, we will collect more information and therefore the results will be more accurate. A study shows that mothers-to-be who are expecting their first child (primigravida) have a longer pregnancy. On average 288 days against 283 days for those who have already had a first child (multiparous).

Our calendar will therefore be calculated by adding days of gestation in relation to the Naegele rule.

  • For primigravida: 1st day of last menstrual period - 3 months + 15 days. That is 8 extra days;
  • For multiparas: 1st day of last menstrual period - 3 months + 10 days and 3 days more;
  • This adds 8 days for primigravida and 3 days for multiparas, compared to the Naegele rule.

Parikh's rule

If you have an irregular cycle, such as for women with polycystic ovarian syndrome (PCOS) for example, the Parikh formula will be used. The Naegele formula may give an incorrect result. The formula will be: day of last period + 9 months - 21 days + length of previous cycles.

Wood's rule

This formula takes into account the length of your usual menstrual cycles and the number of pregnancies you have had and completed.

To begin, calculate your due date (DPA):

  • For primigravida: 1st day of last menstrual period + 1 year - 2 months and two weeks ;
  • For multiparous women: 1st day of last period + year - 2 months and 2.5 weeks.

Then, use the date of delivery that you have obtained and adapt it to the length of your cycle:

  • For women with cycles longer than 28 days APD + (actual cycle length - 28 days) = APD ;
  • For those with 28-day cycles: WFA - (28 days - actual cycle length) = WFA.

Calculating from the date of conception

Even if you know the date of your last sexual intercourse, the date of conception is rarely known because sperm have a maximum lifespan of 5 days and the woman's body ovulates 24 hours after being released from the ovary.

Calculating with an ultrasound

Gynecologists or midwives will perform a dating ultrasound to get an accurate estimate of the baby's age based on its development. In general, the ultrasound dating is done between the 11th and 13th week of amenorrhea, absence of menstruation.

Calculating with the date of transfer or insemination - PMA

When you are in the MAP medical course and in particular in the framework of an IVF, the date of conception will be very simple to calculate since it will correspond to the moment when you carried out an embryo transfer. This corresponds to the age of the embryo or the date of ovulation.

Pregnancy calendar FAQ

How do I calculate my pregnancy calendar?

Fill in the date of your last period, the length of your menstrual cycle and the number of children you already have to calculate your pregnancy calendar and know your due date.

Which week is the month of your pregnancy?

On average, your pregnancy lasts 41 weeks. Identify the months and trimesters of your pregnancy with our pregnancy calendar.

What is the most difficult week of pregnancy?

Pregnancy lasts nine months. In general, the first trimester is considered the most difficult. Between nausea, fatigue and fear of miscarriage, the 11th week of pregnancy is often the most critical.

When is my maternity leave?

Maternity leave starts 6 weeks before the birth, this is the prenatal leave. After the birth, you have 10 weeks of postnatal leave. These data concern maternity leave for the 1st and 2nd child. From the third child onwards, the periods are extended. Calculate the start and end date of your maternity leave quickly with our pregnancy calendar!

Les informations issues des articles présents sur le site sont des informations générales. Bien qu’elles aient été relues par des professionnels de santé, ces informations ne sont pas exemptes d’erreurs, ne constituent pas des conseils de santé ou des consultations et n’ont pas vocation à fournir un diagnostic ou proposer un traitement. Ces informations ne peuvent, en aucun cas, se substituer à un avis médical et ne peuvent pas remplacer une consultation auprès d’un professionnel de santé. Pour toute question, nous vous invitons à consulter votre médecin.