Supporting you, Campaigning for all
• 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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Mental health and pregnancy - Phoeb…

AIMS Journal, 2024, Vol 36, No 2 By Phoebe Howe In early 2016, I was diagnosed with Emotionally Unstable Personality Disorder (EUPD, formally known as Borderline Personal…

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Type 1 diabetes and maternity care:…

AIMS Journal, 2024, Vol 36, No 2 By Jane Furness My daughter is two and a half years old now, but I still have daily flashbacks of our pregnancy and birth together. My hu…

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Epilepsy and pregnancy

AIMS Journal, 2024, Vol 36, No 2 Kim Morley is a nurse and midwife with advanced qualifications who has been instrumental in providing specialised care for women with epi…

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Events

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Birth Rites Collection Summer Schoo…

http://www.birthritescollection.org.uk/ It is a 4-day in person and online summer school which has a programme of artists presenting their work. This year the themes are…

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Latest Campaigns

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Birth Trauma Inquiry Open Letter in…

We write this letter in response to the recently published APPG Report on Birth Trauma which can be found here The report was extremely moving and we honour the brave con…

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Evidence Submission to The House of…

Find submission on UK Parliament webite https://committees.parliament.uk/writtenevidence/129150/pdf Introduction AIMS (Association for Improvements in the Maternity Servi…

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What are the priorities for midwife…

AIMS is proud to be supporting the RCM's Research Prioritisation project as a Project Partner and with one of our volunteers on the Steering Group www.rcm.org.uk/promotin…

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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.