when are you out of the first trimester

You’re generally considered out of the first trimester at the end of week 13 of pregnancy, so you enter the second trimester at the start of week 14.

Trimester timing in weeks

• Many medical sources define the first trimester as lasting from week 1 through the end of week 13 of pregnancy.

• That means the second trimester usually starts at 14 weeks, even though some organizations or articles may round slightly differently (for example, saying “up to 12 weeks” or “through 14 weeks”).

Why there’s some variation

• Different clinics or websites sometimes define the first trimester as conception to 12 weeks, 13 weeks, or even 14 weeks because a “trimester” is about 12–14 weeks and is a rough division of a ~40‑week pregnancy.

• Major medical providers like the Cleveland Clinic and many obstetric guidelines commonly use “up to the end of week 13” as the cutoff for the first trimester.

What this means for symptoms and care

• Symptoms like nausea and fatigue often ease somewhere between about 11 and 15–16 weeks, but they do not switch off exactly when the trimester changes.

• If you are unsure how many weeks pregnant you are, your healthcare provider can date the pregnancy (often via last menstrual period and/or ultrasound) and tell you exactly which week and trimester you are in.

TL;DR: When people ask “when are you out of the first trimester,” the most widely used answer is: once you’ve completed 13 weeks of pregnancy and hit 14 weeks, you’re in your second trimester.

Information gathered from public forums or data available on the internet and portrayed here.