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how long is first trimester

Want to know what to expect during your pregnancy? You’ve come to the right place! Our illustrated pregnancy calendar is a detailed guide to all the changes taking place in your baby — and in you.

Each week of pregnancy includes a description of your baby’s development, as well as an explanation of the changes taking place in your body. You’ll also find important medical info that will help keep you and your baby healthy.

Watch Your Baby Grow

A Word About Due Dates and Trimesters

After you announce your pregnancy, the first question you’ll probably be asked is “When are you due?” At your first prenatal visit, your health care provider will help you determine an expected delivery date (EDD). Your EDD is 40 weeks from the first day of your last menstrual period (LMP). 

It’s important to remember that your due date is only an estimate — most babies are born between 38 and 42 weeks from the first day of their mom’s LMP and only a small percentage of women actually deliver on their due date.

Another common term you’ll hear throughout your pregnancy is trimester. A pregnancy is divided into trimesters:

  • the first trimester is from week 1 to the end of week 12
  • the second trimester is from week 13 to the end of week 26
  • the third trimester is from week 27 to the end of the pregnancy

Getting Started

To get started, simply click below on the week of pregnancy you’d like to view. Many of the articles include links to other pregnancy and newborn articles with more information.

Check back every week of your pregnancy to see how your baby is developing and to find out what changes you can expect in your own body, too!

PREGNANCY CALENDAR: A week-by-week guidePREGNANCY CALENDAR: A week-by-week guideNext

  • Trimester 1
  • Trimester 2
  • Trimester 3

You may not look pregnant yet — but chances are you’re feeling it. That’s because a flood of pregnancy hormones is prepping your body to play host to your baby for the next nine months — so you could be in line for quite a few aches and pains, from fatigue to flatulence.

While you might be less than thrilled with some of these symptoms, try to remind yourself that these temporary discomforts are part of the incredible process that’s happening inside: You’re growing a child!

How long is the first trimester?

The first trimester lasts from week 1 through approximately the end of week 13 of pregnancy, or about months 1 to 3. 

Not sure what week you are in your pregnancy? The first step to nailing your current week down is to calculate your due date. Keep in mind that your date might change (especially if you have irregular periods), so try to go with the flow.

First trimester symptoms

A lot happens for you in the first trimester. A couple of the most common early symptoms of pregnancy you may experience:

  • Morning sickness: Unfortunately it doesn’t just strike in the morning — and it typically starts up by about week 6 of pregnancy. Ginger tea or drops might help, as can small but frequent meals. If it’s severe, you might want to consider talking to your doctor about medications to treat the symptoms of pregnancy-related nausea.
  • Tender breasts: So tender, so tingly and so big! You might be wondering where your old boobs went by about week 6.
  • Mood swings: You may (or may not) feel up, then down, then up again by week 7. If you have a history of depression or think it might be more serious, talk to your doctor about getting screened for prenatal depression.

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