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

« »

Book Review: Mothership by Francesc…

AIMS Journal, 2019, Vol 31, No 4 Reviewed for AIMS by Jo Dagustun Mothership By Francesca Segal Chatto and Windus, 2019 288 pages £14.99 ISBN 978-1-78474-269-0 Find this…

Read more

Book Review: Eleven Hours by Pamela…

AIMS Journal, 2019, Vol 31, No 4 Reviewed for AIMS by Emma Mason Eleven Hours By Pamela Erens Published by Tin House Books 2016 ISBN 978-1941040294 176 pages Publisher's…

Read more

Book Review: The Breast Book by Emm…

AIMS Journal, 2019, Vol 31, No 4 Reviewed for AIMS by Clara Hubbard, age 12 The Breast Book: A puberty guide with a difference - it's the when, why and how of breasts By…

Read more

Events

« »

NICE Annual Conference 2020

Registration for the NICE Annual Conference 2020 will open on 22 January 2020. For more details and to register your interest, please visit http://www.niceconference.org.…

Read more

IMUK National Conference 2020

The theme of IMUK's 2020 National Conference 2020 is The Science Behind The Art of Midwifery. Speakers to be announced and tickets will be released soon. Information is a…

Read more

Northern Maternity & Midwifery Fest…

The Northern Maternity & Midwifery Festival will be returning on Thursday 9th July 2020. There is a call for papers and award nominations are being accepted. For more inf…

Read more

Latest Campaigns

« »

AIMS' Response to Hull Daily Mail a…

AIMS has responded to the Hull Daily Mail's article entitled, " https://www.hulldailymail.co.uk/news/health/baby-born-bus-stop-shoelace-3571474 ". 26 November 2019 Dear E…

Read more

AIMS Response to NMC Consultation o…

The Nursing and Midwifery Council (NMC) plays a key role in the ongoing quality assurance and regulation of the maternity services and its staff. Effective and efficient…

Read more

AIMS Submission to the UN Special R…

Call for submissions: Mistreatment and violence against women during reproductive health care with a focus on childbirth The mandate of the United Nations Special Rapport…

Read more

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.