Instantly identify your current trimester, pregnancy week, and days remaining in each phase of your pregnancy journey.
1st: Weeks 1–13 | 2nd: Weeks 14–27 | 3rd: Weeks 28–40
Pregnancy is divided into three trimesters of approximately 13 weeks each, with distinct developmental milestones, common symptoms, and prenatal screening tests in each phase.
The most critical period for fetal development — all major organs and body systems form. The embryo is most vulnerable to toxins and nutritional deficiencies. Key screenings: 8–12 week ultrasound, first-trimester NIPT/nuchal translucency screening.
The "golden trimester" — nausea typically fades, energy returns, and the baby bump becomes visible. Baby begins moving around weeks 18–22. Key screenings: anatomy ultrasound (18–22 weeks), glucose tolerance test (24–28 weeks).
Baby gains most of its weight here, growing from ~2.5 lbs to ~7.5 lbs. Common symptoms: Braxton Hicks, back pain, heartburn, frequent urination. Key milestones: Group B Strep test (35–37 weeks), weekly OB visits from week 36.
Medical Disclaimer: This tool is for educational purposes only and should not replace professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider for personalized guidance.
The pregnancy trimester calculator tells you exactly which trimester you're in, how many weeks remain in your current trimester, and what key milestones are coming up. Each trimester brings distinct changes for both mother and baby.
The most critical period of fetal development. All major organs, the nervous system, and the heart form during weeks 6–10. Nausea, fatigue, and breast tenderness are most intense here. The risk of miscarriage is highest and decreases significantly after week 12.
Often called the 'honeymoon trimester' — nausea eases, energy returns, and the baby bump becomes visible. You'll feel the first baby movements (quickening) around weeks 18–22. The anatomy scan at 20 weeks checks all major structures.
The final stretch! Baby gains most of its weight and the lungs mature. Braxton Hicks contractions increase. Pack your hospital bag by week 36. Baby is full-term at 39 weeks.