US Medical Term · maternity
Trimester
Trimestre
In 9 languages
| Language | Term |
|---|---|
| English | Trimester |
| Spanish (Español) | Trimestre |
| Chinese (中文) | 孕期三個月 |
| Korean (한국어) | 임신 삼분기 |
| Vietnamese (Tiếng Việt) | Tam cá nguyệt |
| Filipino (Tagalog) | Trimestre ng pagbubuntis |
| Portuguese (Português) | Trimestre gestacional |
| Thai (ภาษาไทย) | ไตรมาสของการตั้งครรภ์ |
| Japanese (日本語) | 妊娠三半期 |
What it means
A trimester is one of the three roughly equal stages of pregnancy, each lasting about 12 to 14 weeks. The first trimester runs from week 1 to week 13, when major organs form and miscarriage risk is highest. The second trimester (weeks 14–27) is often the most comfortable period; you may feel the baby move. The third trimester (weeks 28–40+) focuses on growth and preparation for birth. Your provider will schedule different tests and screenings depending on which trimester you are in, so knowing your trimester helps you understand what to expect at each visit.
How to say it
Sentences a patient might use with a doctor, nurse, pharmacist, or insurer:
I'm in my second trimester — what screenings should I expect at this stage?
Estoy en mi segundo trimestre — ¿qué exámenes debo esperar en esta etapa?
Is morning sickness normal in the first trimester?
¿Las náuseas matutinas son normales en el primer trimestre?
What changes should I watch for as I enter the third trimester?
¿Qué cambios debo vigilar al entrar al tercer trimestre?
Where you'll see it
Related ICD-10-CM category
Z34 Encounter for supervision of normal pregnancyRelated terms
Sources
Last reviewed: September 2026