Pregnancy Due Date Calculator

The standard clinical method is Naegele's Rule: add seven days to the first day of your Last Menstrual Period (LMP) and add nine months. This assumes a 28-day cycle. Our engine adjusts for cycle length and also supports ultrasound-based or conception-date calculations for higher accuracy.

No. The EDD is an estimate. Only about 4-5% of babies are born on their exact due date. Most births occur between 37 and 42 weeks of pregnancy. It serves as a clinical anchor for monitoring development rather than a strict deadline.

If your cycle is longer than 28 days, you likely ovulated later, meaning your due date may be later than Naegele's Rule suggests. Conversely, a shorter cycle implies earlier ovulation. Our S-Class engine allows for custom cycle length adjustments to mitigate this variance.

If you know the exact date of intercourse or ovulation, the due date is calculated by adding 266 days (38 weeks). This is often more precise than LMP because it accounts for individual ovulation timing.

For IVF, the 'conception date' is known precisely. For a Day 3 embryo transfer, the due date is calculated by adding 263 days. For a Day 5 transfer, it is 261 days from the transfer date.

Pregnancy is divided into three stages: First Trimester (Week 1-13), Second Trimester (Week 14-27), and Third Trimester (Week 28 to birth). Each stage marks distinct biological milestones for both the mother and the fetus.

Yes. Early ultrasounds (6-12 weeks) are considered the most accurate method for dating a pregnancy, as fetal growth is highly uniform during this period. If an ultrasound date differs from an LMP date by more than 7 days, clinical providers usually adopt the ultrasound date.

According to ACOG standards, 'Full Term' is between 39 weeks 0 days and 40 weeks 6 days. 'Early Term' is 37-38 weeks, and 'Late Term' is 41 weeks.

Known as 'quickening,' this usually occurs between weeks 16 and 22. First-time mothers may feel it later (around week 20), while those who have been pregnant before may detect it as early as week 16.

The zodiac sign is determined by the position of the sun on the estimated due date. While medically irrelevant, it is a common demographic milestone for parents planning for their child's arrival.

Weight gain targets depend on your pre-pregnancy BMI. Generally, women with a normal BMI are advised to gain 25-35 pounds. Always consult with a healthcare provider for personalized nutritional goals.

Most providers schedule the first official 'dating' visit between 8 and 12 weeks. However, preconception health and early confirmation are vital for starting prenatal vitamins (folic acid).

The fourth month (start of the second trimester) is often called the 'Golden Month' as morning sickness typically wanes and energy levels increase before the physical strain of the third trimester begins.

Prolonged high stress can lead to hormonal shifts, potentially increasing the risk of preterm labor. Maintaining psychological well-being is as critical as physical monitoring in 2026 maternal health protocols.

Expectant parents are advised to have a bag ready by week 36. Essentials include birth plans, insurance info, nursing clothes, and newborn essentials like a car seat (required by law in most jurisdictions).