When reading or talking about pregnancy you may have come across the term ‘trimesters’ and be unsure as to what a trimester actually is.

Basically, the average length of pregnancy is 40 weeks and this time is divided into thirds and referred to as trimesters. The medical team who support you through your pregnancy will use the term frequently and if at any time you are unsure of when they are referring to, you should always ask them to clarify and explain.

Some people use different methods of working out exactly which trimester they are in although as a general rule:

  1. The first trimester starts from the first day of your last menstrual period (LMP) and lasts until the end of week 13.
  2. The second trimester starts from week 14 until the end of week 27.
  3. The third trimester starts at week 28 of your pregnancy and ends at the beginning of your labour.

For more information on how your baby is growing and changing throughout each trimester and how your body is changing, growing and preparing for childbirth, please see our ‘Your Pregnancy, week by week’ section by clicking here

by Jenny, mum to William and James

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