Pregnancy tools and week-by-week guidance
Calculate an estimated due date from your last period, conception date, ultrasound dating, or IVF transfer. Then get a personalized pregnancy report with current week, trimester, baby size, important dates, prenatal test windows, and practical planning tips.
A pregnancy due date is the estimated day a baby may be born. It is usually set at 40 weeks of gestational age, counted from the first day of the last menstrual period. The due date is useful for planning prenatal visits, screening windows, fetal growth checks, and birth preparation, but it is not a guarantee. Many healthy pregnancies deliver before or after the exact date.
The most common approach starts with the last menstrual period and adds 280 days. If cycles are longer or shorter than 28 days, the estimate may shift. Conception-based dating adds 266 days to the estimated conception date. IVF dating uses transfer date and embryo age. Ultrasound dating estimates gestational age from fetal measurements.
Naegele's Rule estimates the due date by adding one year, subtracting three months, and adding seven days to the first day of the last period. This is similar to adding 280 days. It assumes a 28-day cycle and ovulation around day 14, so it is less precise for irregular cycles.
IVF dating can be more precise because fertilization and transfer timing are known. A day 5 embryo transfer usually has a different calculation than a day 3 transfer. Fertility clinic records should be treated as the source of truth.
Early ultrasound can help confirm or adjust pregnancy dating, especially when cycle dates are uncertain. Later ultrasound is often more useful for growth assessment than for changing the official due date.
Pregnancy is commonly divided into three trimesters. The first trimester focuses on early development and initial screening. The second trimester includes rapid growth and the anatomy scan. The third trimester focuses on growth, movement awareness, delivery planning, and late-pregnancy testing.
Weeks 1-13 bring major organ formation, hormonal changes, nausea, fatigue, breast tenderness, and first prenatal labs. This is also when many people discuss genetic screening options.
Weeks 14-27 often feel more stable for many people. The baby grows quickly, movement may become noticeable, and the anatomy scan usually occurs around weeks 18-22.
Weeks 28-birth include stronger movement patterns, birth planning, glucose follow-up if needed, Tdap timing, group B strep screening, and discussions about labor signs.
Symptoms can include nausea, fatigue, bloating, breast changes, heartburn, backache, leg cramps, sleep changes, and Braxton Hicks contractions. Call your care team for severe pain, heavy bleeding, fluid leakage, severe headache, vision changes, fever, or decreased fetal movement later in pregnancy.
A balanced pregnancy diet often includes protein, whole grains, fruits, vegetables, iron-rich foods, calcium, iodine, choline, and omega-3 sources. Food safety matters: ask your clinician about local guidance for fish, caffeine, unpasteurized foods, and supplements.
Many uncomplicated pregnancies can include regular moderate activity, such as walking, swimming, prenatal yoga, or strength work. People with high-risk pregnancies, pain, bleeding, or activity restrictions should follow individualized medical guidance.
Explore dedicated week pages with fetal development, symptoms, prenatal tests, nutrition, warning signs, and baby size illustrations.
Quick educational answers for common pregnancy food and safety questions. For symptoms, medicines, high-risk pregnancy, or urgent concerns, contact a qualified healthcare professional.
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It gives an estimate based on the dates you enter. A clinician may adjust the official due date using early ultrasound, fertility records, cycle history, or medical context.
LMP dating can be less reliable when cycles are irregular. Ultrasound or fertility-treatment dating may be more useful.
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No. This website is educational and should not be used to diagnose, treat, or make urgent medical decisions.