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First Trimester: What to Expect Week by Week

April 30, 2026 8 min read
First Trimester: What to Expect Week by Week

The first trimester spans weeks one through twelve and is a period of rapid development for your baby, alongside significant hormonal shifts in your own body.

By week six, your baby's heart begins to beat, and early morning sickness often sets in as hCG levels rise. Fatigue and breast tenderness are common as your body redirects energy toward supporting the pregnancy.

Around week eight, your first prenatal ultrasound can confirm your due date and detect a healthy heartbeat. By week twelve, most major organs have formed, and the risk of miscarriage drops significantly.

Throughout this trimester, prioritize a folic-acid-rich diet, gentle movement, and consistent prenatal visits. Your care team will monitor your progress closely and address any symptoms as they arise.

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