Question 1

How is the pregnancy due date calculated?

Accepted Answer

Most obstetricians use Naegele's Rule: add 280 days (40 weeks) to the first day of your last menstrual period (LMP). Our calculator adjusts that by your cycle length — if your cycle is longer than 28 days, ovulation happens later, so the due date shifts accordingly.

Question 2

How accurate is a due date calculator?

Accepted Answer

When the LMP is known, the estimated due date is typically accurate within ±7 days. Only about 5% of babies are actually born on the calculated date. A first-trimester ultrasound (between 8 and 13 weeks) gives the most precise dating.

Question 3

What if my cycle is irregular?

Accepted Answer

For irregular cycles, we add the difference between your cycle length and the standard 28 days. For example, with a 32-day cycle, we add 4 extra days. If your cycles are highly irregular, an early dating ultrasound at Vinayaka Hospital is the most reliable option.

Question 4

Can I calculate my due date from the conception date?

Accepted Answer

Yes. If you know the conception date (often the ovulation day), the estimated due date is conception + 266 days. Choose 'Conception Date' in the calculator and we'll handle the math for you.

Question 5

How do I find my pregnancy week?

Accepted Answer

Pregnancy week = (Today − LMP) ÷ 7. So if your LMP was 10 weeks ago, you're 10 weeks pregnant — even though conception happened around 8 weeks ago. This is the convention used by every obstetric guideline worldwide.

Question 6

When does each trimester start and end?

Accepted Answer

First trimester: week 1 to 12. Second trimester: week 13 to 27. Third trimester: week 28 to 40. Babies born between 37 and 42 weeks are considered full-term.

Question 7

Is a 9-month or 10-month pregnancy correct?

Accepted Answer

Pregnancy is roughly 9 calendar months, but obstetrically it's 40 weeks (or 10 lunar months of 28 days each). Both are correct — they just measure time differently.

Question 8

When should I book my first appointment at Vinayaka Hospital?

Accepted Answer

Ideally between week 6 and week 8. We perform a dating ultrasound, confirm viability and start your antenatal care plan. You can book online, call +91 99809 55836 or WhatsApp us anytime.

Question 9

Does Vinayaka Hospital offer painless delivery?

Accepted Answer

Yes. We offer 24×7 epidural analgesia, water birth and natural birthing rooms with experienced obstetricians and anaesthetists on-site at our BTM 4th Stage facility.

Question 10

Will the calculator store my personal data?

Accepted Answer

No. All calculations run locally in your browser. We do not store, transmit or sell your information — your privacy is paramount.

Notes from our consultants.

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