How many are the total weeks of pregnancy? 


Pregnancy is an exciting journey for expecting partners, which is filled with lots of milestones and memories. The baby is growing and developing inside the womb at a rapid pace. Pregnancy math can be very confusing, especially for females with first pregnancy. Here is everything you need to know about the total weeks of pregnancy and pregnancy trimesters.


How many weeks are in a pregnancy?

comfortable pregnant female

There are in total 40 weeks (or 280 days) in a normal, healthy pregnancy. Day 1 of pregnancy is the first day of the female’s last period. However, only about 30 % of pregnancies reach until week 40. The truth is that a full-term pregnancy is considered to be between 39 to 41 weeks long. A baby born between 39 to 41 weeks is born in a normal timespan.

Also Read: How does pregnancy change the female?


How many weeks are there in a trimester?


There are 3 trimesters in a pregnancy. The first trimester approximately lasts from week 1 to week 13, the second trimester nearly lasts from week 14 to week 27 and the third trimester lasts from week 28 to week 40 (and it may go up). Basically, there are 13 (or 14) weeks in each trimester. 


How is pregnancy considered for 9 months if there are 40 weeks of pregnancy?

pregnant woman at doctor

A female’s 40 weeks of pregnancy are counted as 9 months. But wait, you must be thinking that there are 4 weeks in 1 month, which makes 40 weeks almost 10 months. Right? In pregnancy terms, you miscalculated a bit here. 4 weeks make 28 days, but some months have 30 days while some have 31 days (except February). This roughly makes each month almost 4.3 weeks long.

Also Read: When will my Baby Bump Start Showing?


Pregnancy chart- Months to Weeks 

growth of embryo in all trimesters

If the explanations sound a bit confusing to you, jump to the conclusion. Here is a simple breakdown of approximately how pregnancy weeks and months are counted and divided in the 3 trimesters –

1st Trimester

  • Month 1- Week 1 to 4
  • Month 2- Week 5 to 8
  • Month 3- Week 9 to 13

2nd Trimester

  • Month 4- Week 14 to 17
  • Month 5- Week 18 to 22
  • Month 6- Week 23 to 27

3rd Trimester 

  • Month 7- Week 28 to 31
  • Month 8- Week 32 to 35
  • Month 9- Week 36 to 40

Also Read: A Healthy Pregnancy will bring a Healthy Baby- Food guide for pregnant women


How can I find out how many weeks am I pregnant?


The total number of weeks a female is in her pregnancy is a little different from how many weeks pregnant she actually is. If a female is 16th week of pregnancy, she is actually or maybe 15 weeks and some days pregnant. This is because doctors calculate the pregnancy weeks from the last period of the female, not from the day or week she possibly conceived. So, your doctor may say you are in week 16 while you are actually 15 weeks pregnant. 


How do you calculate your due date?

Due date written on calendar

Most females rely on the doctor to find out their pregnancy due date. But you can actually calculate it yourself. A female’s due date is calculated counting from her last menstrual period (LMP) with 40 weeks added to it. That will give you your due date. To be completely sure, double-check it with your doctor! 


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