Medical Disclaimer

Not Medical Advice

Nothing on this site — no calculator result, article, chart, or timeline — constitutes medical advice. Our tools apply standard formulas (such as Naegele’s Rule, IVF transfer dating, and ultrasound-based dating) to the dates you provide and return an estimate. A formula cannot know your medical history, cycle patterns, fertility treatment details, or complications, and it cannot examine you. Only a qualified healthcare provider — your OB-GYN, midwife, fertility specialist, or family doctor — can give you advice about your pregnancy.

Although every page is researched from clinical guidelines before publication, guidelines evolve and individual circumstances vary. Always confirm your due date and any pregnancy-related decision with your provider, and never delay seeking care because of something you read here.

Estimates, Not Promises

A due date is an estimate of when your pregnancy reaches 40 weeks, not an appointment. Research suggests only a small fraction of babies arrive on their exact due date — most arrive within the weeks surrounding it. Calculator results can shift after an ultrasound, blood work, or clinical assessment, and your provider’s dating always takes priority over any online tool. Use our calculators as planning tools: for scheduling prenatal visits, preparing for parental leave, and understanding your timeline — not as medical determinations.

How to Use This Site Safely

• Use due date and pregnancy calculators as planning and educational tools only.
• Confirm every result with your healthcare provider at your next visit.
• Do not use calculator results to make medical decisions — such as scheduling interventions, interpreting test results, or judging whether symptoms are normal.
• Do not rely on this site for emergency situations. See below.

When to Seek Medical Help Immediately

Contact your healthcare provider, midwife, or emergency services right away if you experience severe abdominal pain, heavy vaginal bleeding (soaking through a pad in an hour or less), dizziness or fainting, shortness of breath, chest pain, fever, severe headache, vision changes, sudden swelling of the face or hands, decreased fetal movement after you have started feeling kicks, or any symptom that feels urgent or wrong. Do not wait to see what a calculator says — get care first.

What Our Calculators Can and Cannot Do

They can: apply standard medical formulas to your dates instantly, help you understand gestational age and trimesters, give you a reasonable planning timeline for work leave and prenatal appointments, and help you prepare questions for your provider.

They cannot: account for irregular ovulation, confirm a pregnancy, diagnose a miscarriage or ectopic pregnancy, interpret hCG levels or ultrasound findings, or tell you whether your symptoms are normal. If any calculator result worries you, treat that worry as a reason to call your provider — not as a diagnosis.

A Note on How Our Content Is Made

Our articles are researched and written by our author using published clinical guidelines and peer-reviewed sources, and formulas are validated against established standards. Even so, no page is a substitute for clinical judgment — which is exactly why this disclaimer exists. Our content is educational information, checked for accuracy but never a replacement for your provider’s advice about your body and your pregnancy.

Animal Pregnancy Content

Our animal pregnancy calculators provide gestation estimates based on standard veterinary references. They are informational only and do not replace veterinary care. Always consult a licensed veterinarian about your animal’s pregnancy, especially if labor seems early, late, or complicated.