Question 1

How is the due date calculated?

Accepted Answer

Due date is calculated using Naegele's rule: first day of last period + 280 days (40 weeks). If your cycle is longer or shorter than 28 days, the calculation is adjusted. Only about 5% of babies are born on their exact due date.

Question 2

How accurate is Naegele's rule?

Accepted Answer

Naegele's rule provides an estimate. The actual due date is most accurately determined by an early ultrasound (6-12 weeks), which measures the baby's size. Your doctor may adjust your due date based on ultrasound findings.

Question 3

What is considered full term?

Accepted Answer

Full term is considered 37-42 weeks. Early term: 37-38 weeks. Full term: 39-40 weeks. Late term: 41 weeks. Post-term: 42+ weeks. Only about 4% of babies are born on their exact due date.

Question 4

Can I calculate due date from conception?

Accepted Answer

Yes. If you know your conception date, add 266 days (38 weeks) to get your estimated due date. Conception typically occurs around ovulation, about 2 weeks after your last period starts.

Question 5

What if my cycle is irregular?

Accepted Answer

For irregular cycles, Naegele's rule is less accurate. An early ultrasound (6-12 weeks) is the most reliable way to determine your due date. Cyra's AI learns YOUR cycle pattern and provides more accurate estimates.

Question 6

When should I see a doctor?

Accepted Answer

Confirm pregnancy with a doctor as soon as you get a positive test. Prenatal care typically begins at 8-10 weeks. If you experience severe symptoms like heavy bleeding or intense pain, seek immediate medical attention.

When Is My Baby Due?

How It Works

Enter Your Dates

AI Calculates

Get Timeline

Frequently asked questions