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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PTSD after Childbirth

AIMS Journal 2007, Vol 19, No 1 Post Traumatic Stress (PTS) is a set of normal reactions to a traumatic experience. Reactions such as dizziness, feeling faint, elevated b…

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Editorial: The label of ‘high risk’…

AIMS Journal, 2022, Vol 34, No 2 By Alex Smith In 2011, Vicki Williams asked in the AIMS journal editorial , “Is this label of ‘high risk pregnancy’ doing women any favou…

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What has the AIMS Campaigns Team be…

AIMS Journal, 2022, Vol 34, No 2 By the AIMS Campaigns Team Written outputs: Campaigns Team responses to the Ockenden Report Ockenden 2022: if we want to see real change,…

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Latest Campaigns

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AIMS statement prepared for the Sta…

In the Stakeholder Council we have a common purpose that focuses on the need for maternity transformation. We do not need to be convinced. Because we know the system is f…

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Ockenden 2022: if we want to see re…

10am on Wednesday March 30, 2022: the final Ockenden Report is published. 12.45pm the same day, the Secretary of State for Health and Social Care, Sajid Javid, stands up…

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AIMS Campaigns Team comment on the…

As long standing campaigners for improvements in the maternity services, AIMS deeply regrets the long series of failings that have led to the Ockenden Report and previous…

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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.