How Many Weeks Is a Pregnancy?

how many weeks is a pregnancy

How many weeks is a pregnancy? You won’t be able to calculate 100% accurate due date. It’s just not possible. Sometimes the due date matches the actual date of the delivery as a result of a coincidence, but no one can tell you for sure when you are going to have a baby because it depends on a lot of aspects.

And even if you belong to that small number of pregnant women who know the exact day of the conception or their ovulation date, it’s not possible for you to predict how fast the sperm will fertilize the egg, how many days it will take for the fertilized egg to go through the Fallopian tube, when the implantation will happen, and how much time the fetus will require to fully develop inside of the womb. No one is able to find out when the baby will be ready for childbirth. Every pregnancy case is individual, and all the aforementioned processes can take various periods of time. However, medical experts have evaluated the average standard which a mother-to-be can focus on.

Which Trimester How Many Months How Many Weeks
FIRST TRIMESTER FIRST TRIMESTER 1 1,2, 3, 4
2 5, 6, 7, 8
3 9, 10, 11, 12, 13
SECOND TRIMESTER SECOND TRIMESTER 4 14, 15, 16, 17
5 18, 19, 20, 21
6 22, 23, 24, 25, 26
THIRD TRIMESTER THIRD TRIMESTER 7 27, 28, 29, 30
8 31, 32, 33, 34, 35
9 36, 37, 38, 39, 40,41,42

The average figures

How many weeks is a pregnancy? Medical science has confirmed that in most cases (70-80%) there are 266 days, or 38 weeks, between the moment of fertilization and the birth. However, the most difficult part of the calculation lies in the fact that women often don’t know when the conception (or ovulation) happened. But almost every woman remembers the date of her last period. That’s why it’s been chosen as a guideline for the due date calculation. Gynecologists say that there are usually 40 weeks (or 280 days) between the first day of a future mother’s last period and her due date. But as one cannot speak of pregnancy on the first day of menstruation, the pregnancy term calculated with the help of this method is called the “gestation period”. In fact, the fetus is approximately 2 weeks younger.37-weeks-pregnant woman

In the majority of cases, the ovulation happens on the 14th day after the end of the period. And if we consider this date as a starting point we’ll find out that the average pregnancy is 280-14=266 days long. But it depends on a person: one woman can have her ovulation a bit earlier, and another – later than normal. So, obstetricians consider “normal” those pregnancies which are 266-294 days long (that is 280 days plus or minus 14). Or, if you want to know how many weeks in a pregnancy, doctors say it should be 38-42 weeks (though that period of time has been recently expanded to 37-43 weeks).

Irregular cycle?

If you count you’ll find out that 280 days, or 40 weeks for that matter, are almost 9 months as people have got used to saying. Obstetricians claim that there are 10 months in a pregnancy – they are speaking about the so-called “lunar months” consisting of 28 days each, of course. That’s also the length of the menstrual cycle of an average woman. So, if you have irregular cycles or your menstrual cycle is more/less than 28 days, you’ll need to take into consideration inaccuracy of measurements. It will be harder to estimate how many weeks is a pregnancy for you. The principle of 280-day-long (40 weeks) pregnancy term is supposed to mean that the woman has a menstrual cycle which lasts 28 days, and the ovulation happens on the 14th day.how many weeks is a pregnancy - woman holding her belly which has clock on it

How many weeks is a pregnancy? The factors of influence

There is no doubt that your state of health, the development and condition of the fetus, heredity, and even your psychological condition will be affecting the pregnancy term. How many weeks is a pregnancy? It will depend on all the abovementioned factors. Medical science knows the cases when women give birth on the day they have decided on (by the time of some national holiday or when their husband returns from a long business trip, for example).

Additional pregnancy math – just in case

How many trimesters are in a pregnancy?

A pregnancy consists of three trimesters: the first trimester (approximately week 1 to 13), the second trimester (week 14 to 26), and the third trimester which lasts from about week 27 to week 40 (or more).

How many weeks are in one trimester?

One trimester has about 13-14 weeks in it.

How many months are in a pregnancy?

There are 4 weeks in a month, so if a pregnancy consists of 40 weeks, this would make a 10-month term. But, as we’ve mentioned before, they would be 28-day-long “lunar months”. Most calendar months have 30/31 days in them (except February), so the average pregnancy lasts 9 months.

So, you see, the calculations are individual. “Plus or minus two weeks” together make up a month! So if you’ve decided to conceive on a day which will allow you to give birth on New Year’s Eve, you can miscalculate the term!how many weeks is a pregnancy - beautiful future mom

And if you are worried about giving birth at the right time or having a premature baby you’ll need to pay attention to your state of health, the condition of the unborn baby, and, of course, medical records and your doctor’s report.

In spite of how many days your pregnancy lasts, this period of time is unforgettable. How many weeks is a pregnancy – it’s not so important. Enjoy your time being pregnant because eventually it will come to an end. May your childbirth be painless and successful, and your baby – healthy and beautiful!

References
1. https://www.whattoexpect.com/pregnancy/pregnancy-health/understanding-pregnancy-week.aspx

2. https://menstrual-cycle-calculator.com/how-many-weeks-pregnant-am-i-pregnancy-calculator/

3. https://www.bellybelly.com.au/pregnancy/40-reasons-to-give-baby-40-weeks-of-pregnancy/

4. https://www.babiesonline.com/articles/pregnancy/a10monthpregnancy.asp

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