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


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On message - What can we learn from…

AIMS Journal, 2020, Vol 33, No 1 By Sophie Martin We all have continuous internal monologues running day and night 1 . Much of what the voices in our heads say is a refle…

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Getting to grips with the first Ock…

AIMS Journal, 2020, Vol 33, No 1 By the AIMS Campaigns Team Donna Ockenden and her team’s first – interim – report was published in December 2020. It starts to lay bare h…

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Editorial: Salutogenesis - Putting…

AIMS Journal, 2020, Vol 33, No 1 By Alex Smith The theme for our March edition of the AIMS Journal is Salutogenesis. Salutogenesis is a term introduced by sociologist and…

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AIMS 60th Anniversary Event - Confe…

POSTPONED FROM JUNE 2020 Making a difference past and future The purpose of the day is to celebrate what Birth Activists in general and AIMS in particular have achieved,…

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AIMS Annual General Meeting 2020

This year’s AGM will be an online meeting, so we plan to keep it to two hours. However, there will be the opportunity to stay, chat and socialise with friends and colleag…

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Latest Campaigns

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Report on the But Not Maternity/Nat…

AIMS and our partners in the But Not Maternity Alliance and National Maternity Voices organised a webinar for MVP/MSLC representatives. The purpose was to raise awareness…

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Press release: We have a roadmap fo…

AIMS and our partners in the But Not Maternity Alliance have issued a press release on the nationwide status of maternity restrictions highlighting the huge variation bet…

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AIMS Submission to the Violence Aga…

AIMS has responded to the call for evidence to inform the Government’s Violence Against Women and Girls (VAWG) strategy 2021 to 2024 Violence Against Women and Girls (VAW…

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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.