Women Supporting Women
• Campaigning for better births for all
• Protecting human rights in childbirth
• Independent information about pregnancy and birth
• Raising awareness of research

For a better birth

Latest Content

Journal

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Book Review: Misconceptions: Truth,…

Complete list of book reviews on the AIMS website AIMS Journal, 2019, Vol 31, No 1 Reviewed for AIMS by Marein Schmitthenner Published by Vintage, 2002 ISBN 0-099-27416-7…

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Obituary of Philomena Canning, Sept…

AIMS Journal, 2019, Vol 31, No 1 By Marie O’Connor Philomena Canning was a fearless advocate of the human rights of mothers in maternity care and of midwives in clinical…

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Clinical Guidelines: Litigation, Pa…

AIMS Journal, 2019, Vol 31, No 1 By Beth Whitehead The purpose of the conference was to explore how evidence-based clinical guidelines are used by defendants, lawyers and…

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Events

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AIMS Volunteers Meeting

Details TBC

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UNICEF Baby Friendly Initiative 201…

28 - 29 November 2019, SEC Centre Glasgow Speakers include: Day 1 Dr Chris van Tulleken – Doctor and leading BBC science presenter Robert Boyle – Clinical Reader in Paedi…

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International Maternity Expo

A two day (12 and 13 November) international maternity festival and trade expo from the producers of All4Maternity , The Practising Midwife and Maternity & Midwifery Foru…

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Latest Campaigns

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Letter to The Guardian in response…

Sent 9th May 2019 By email ( guardian.readers@theguardian.com ) Dear Sir, I write in response to the opinion piece by Barbara Ellen entitled “Meghan Markle’s home birth s…

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AIMS Response to MBRRACE-UK Report…

Download PDF MBRRACE-UK: Saving Lives, Improving Mothers’ Care MBRRACE-UK: Perinatal Mortality Surveillance report for births in 2016 www.npeu.ox.ac.uk/mbrrace-uk/reports…

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Implementing Better Births: Continu…

Download PDF Commissioners and providers across England, guided by their MVPs, are working across the country to implement sustainable Continuity of Carer models of care,…

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Pregnancy Calculator i

When's your due date?

What does your "due date" mean? How long is a normal pregnancy? How might being given a due date affect you and your baby? Enter the first day of your last period to discover when you're most likely to give birth.... and to find out more about due dates, induction and "post date" babies.
You are weeks pregnant.
Date of the first day of your last period
Adjusted cycle length

Date of the first day of your last period

The date of your last period allows an estimation of when you ovulated and conceived your baby.

A surprising number of women will have a bleed after they are pregnant, and although seeking advice from a doctor or midwife is recommended, usually this bleeding is not a problem.

Adjusted cycle length

Your menstrual cycle is counted from the first day of one period to the first day of the next. The average menstrual cycle is 28 days long, but many women will have longer or shorter cycles than this.

Ovulation usually takes place about 14 days before the next period. This means in a short cycle ovulation will be less than 14 days after your last period and with a long cycle more than 14 days after your last period. Giving the length of the cycle allows this to be taken into account in calculating your due date.

Many women have irregular cycles which make using the last day of their period less reliable for estimating due date.