Estimate your due date, understand pregnancy milestones, visualize your baby's development week by week, track trimester progress, and explore educational guidance for a healthier, more informed pregnancy journey.
Note: Twin pregnancies often deliver earlier than the estimated due date for single pregnancies.
Educational information to help you understand your pregnancy journey and make informed decisions.
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Evidence-based education to help you understand your pregnancy journey.
An estimated due date (EDD) marks the end of the 40th week of pregnancy. Only about 4% of babies are born exactly on their due date — most arrive within two weeks before or after. The due date is a planning tool to schedule prenatal care and prepare for your baby's arrival, not a precise prediction.
The most common method is Naegele's Rule: add 280 days (40 weeks) to the first day of your last menstrual period, adjusting for your cycle length. Conception-based dating adds 266 days, while IVF transfers use 263 or 261 days depending on the transfer day. Early ultrasound dating is highly accurate.
Pregnancy is divided into three trimesters of roughly 12-14 weeks each. The first trimester focuses on organ formation, the second on rapid growth and development, and the third on final maturation and weight gain. Each trimester brings unique milestones and changes for both mother and baby.
From a cluster of cells to a fully formed baby, the journey is remarkable. By week 6, the heart beats. By week 12, all major organs are formed. Around week 20 (halfway), the baby can hear sounds. By week 28, the baby can blink. At 37 weeks, the baby is considered full term.
Eating well during pregnancy supports both mother and baby. Key nutrients include folic acid (for neural tube development), iron (for increased blood volume), calcium (for baby's bones), and omega-3 DHA (for brain development). Most healthcare providers recommend a daily prenatal vitamin.
Morning sickness, fatigue, breast tenderness, and frequent urination are common in the first trimester. The second trimester often brings renewed energy. The third trimester may involve back pain, swelling, shortness of breath, and Braxton Hicks contractions. Every pregnancy is unique.
As you approach your due date, consider: creating a birth plan, packing a hospital bag, taking childbirth education classes, discussing pain management options, arranging transportation, and preparing your home for the baby. Your healthcare provider will guide you on when to go to the hospital.
The postpartum period (often called the "fourth trimester") lasts about 6-8 weeks after birth. Your body undergoes significant changes as it recovers. Rest, nutrition, hydration, and support are essential. Don't hesitate to ask for help and reach out to your healthcare provider if you have concerns.
Yes. If an early ultrasound shows a significant difference (more than 5-7 days) from the LMP-based estimate, your healthcare provider may adjust the due date. Most adjustments are made before 20 weeks.
If you don't know the first day of your last period, an early ultrasound can estimate gestational age. The crown-rump length measurement at 8-12 weeks is particularly accurate for dating.
Most home pregnancy tests are over 99% accurate when used correctly after a missed period. However, false negatives are more common than false positives. If you get a negative result but still suspect pregnancy, wait a few days and test again.
First-time mothers typically feel movement (quickening) between 18-22 weeks. Women who have been pregnant before may feel it earlier (16-18 weeks). By the third trimester, you should feel consistent daily movements.
Regular, moderate exercise is safe and beneficial for most pregnant women. Walking, swimming, stationary cycling, and prenatal yoga are excellent choices. Always consult your healthcare provider before starting or continuing an exercise routine.
Full-term is defined as 39 to 40 weeks. Early term is 37-38 weeks, late term is 41 weeks, and post-term is 42+ weeks. Babies born at 39-40 weeks have the best health outcomes, with fully mature lungs and organs.
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This calculator is intended for educational and informational purposes only. Estimated due dates are based on standard medical calculations and may not reflect the actual delivery date. Only about 4% of babies are born exactly on their estimated due date.
The information provided by this tool does not constitute medical advice, diagnosis, or treatment. Pregnancy is a complex medical condition, and every pregnancy is unique. Always consult a qualified healthcare professional for pregnancy care, prenatal testing, and medical guidance.