When Does Your First Trimester End

When Does Your First Trimester End?

The first trimester can be an exciting, yet nerve-wracking, time for parents-to-be. It’s often filled with a range of emotions as they prepare for the arrival of their little one. But when does this important first trimester actually end? Depending on your personal definition, the answer may vary.

Medical Definition of the First Trimester

The medical definition of the first trimester is the first 13 weeks of your pregnancy. This definition is based upon the fact that your due date is calculated from your last menstrual period, which is typically two weeks before conception. In other words, the first 13 weeks of your pregnancy are actually the 15 weeks that have elapsed since your last period.

Common Perceptions of the First Trimester

However, many healthcare professionals—and expectant parents—understand the first trimester to be the first three months of pregnancy, or the first 12 weeks since conception. On this basis, you can expect the first trimester to end in week 12 or 13 of your pregnancy.

Symptoms of the First Trimester

During the first trimester of your pregnancy—which is often referred to as the first three months—your body will undergo a number of changes in preparation for the arrival of your little one. Some of the common symptoms experienced during the first trimester include:

  • Tiredness
  • Sensitivity to certain smells
  • Nausea and morning sickness
  • Frequent urination
  • Breast tenderness and/or swelling
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Important Milestones in the First Trimester

During the first trimester, you will experience a number of important milestones. These include:

  • Weeks 4-8: During these weeks you can expect to feel your baby’s initial movements. Your baby’s heart starts to beat at around week six and all their major organs have started to develop.
  • Weeks 9-12: During these weeks, your baby’s rapid growth continues and the shape of their features start to form. You may also experience a ‘baby bump’, as the uterus starts to expand to accommodate thegrowth of your little one.

Preparing for the Future

Though the first trimester is a critical time for growth and development, the second and third trimesters often require expectant parents to prepare for the big day. This may involve creating a nursery, attending prenatal classes or purchasing necessary items such as car seats and cribs.

No matter when you define the end of your first trimester, it’s an important time for you and your baby. Don’t be afraid to ask your healthcare provider if you have any questions or concerns.

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