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Stages of pregnancy

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Infographic on the stages of pregnancy in weeks, months and trimesters.

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Pregnancy stages

Keep track of your pregnancy by weeks, months and trimesters.

First trimester

  • 1 month - 1 to 4 weeks
  • 2 months - 5 to 8 weeks
  • 3 months - 9 to 13 weeks

Second trimester

  • 4 months- 14 to 17 weeks
  • 5 months - 18 to 21 weeks
  • 6 months - 22 to 36 weeks

Third trimester

  • 7 months - 27 to 30 weeks
  • 8 months - 31 to 35 weeks
  • 9 months - 36 to 40 weeks

Pregnancy normally lasts about 40 weeks from the first day of your last period. You reach full term at 37 weeks. If your labour doesn’t start by the time you reach 42 weeks, you would then be overdue.

If you have any questions about your pregnancy, call Pregnancy, Birth and Baby to speak to a maternal child health nurse on 1800 882 436.

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Last reviewed: April 2025


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Early signs of pregnancy

If you have a regular menstrual cycle, the most reliable sign of pregnancy is a missed period. Find out some other early signs that you are pregnant.

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Anatomy of pregnancy and birth

From conception to giving birth, your body goes through many physical changes. Learn what happens to your body during pregnancy and labour.

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Anatomy of pregnancy and birth - uterus

Your uterus is your baby's home during pregnancy. Read how the uterus works and how it changes during pregnancy, labour and after you give birth.

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Anatomy of pregnancy and birth – vulva

The vulva is the external part of the female genitalia. Learn more about its anatomy and role during pregnancy and labour.

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Anatomy of pregnancy and birth - cervix

Your cervix goes through many changes during pregnancy and childbirth. Find out about your cervix, what it does and why it's important.

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Anatomy of pregnancy and birth - pelvis

Your pelvis helps to carry your growing baby and is tailored for vaginal births. Learn more about the structure and function of the female pelvis.

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Making Sense Of Pregnancy and Birth podcast

Making Sense of Pregnancy and Birth is a 20 episode podcast providing information for those planning a pregnancy and expectant parents.

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Anatomy of pregnancy and birth - abdominal muscles

Find out how pregnancy can affect your abdominal muscles and why strengthening them during pregnancy and after birth is important.

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Anatomy of pregnancy and birth - perineum and pelvic floor

Read about your pelvic floor, including your perineum, which lies across the bottom of your pelvis and can be damaged during pregnancy and childbirth.

Read more on Pregnancy,Birth & Baby website

Pregnancy rhinitis

Pregnancy rhinitis is a common problem. Your symptoms may include a stuffy nose and watery eyes. Learn more about how you can relieve your symptoms.

Read more on Pregnancy,Birth & Baby website

Call us and speak to a Maternal Child Health Nurse for personal advice and guidance.

Need further advice or guidance from our maternal child health nurses?

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