The calculator on this page can help you work out when you might expect your baby to arrive. This will give you a rough idea. As part of your antenatal care, your midwife will also offer you a dating scan that will give you a more accurate date for the birth of your baby.
Pregnancy normally lasts from 37 weeks to 42 weeks from the first day of your last period. To find your due date, use the drop down menus below to enter the date of the first day of your last period, and click 'calculate date' - the calculator will do the rest.
Click here for the NHS's Pregnancy due date calculator
For the last ten years, Best Beginnings has been working tirelessly to reduce inequalities in child health and to give every child in the UK the best start. We work closely with parents, leading healthcare professionals, royal colleges, other charities and the Department of Health to create innovative evidence-based resources, including our free multi-award-winning Baby Buddy app.
Best Beginnings' resources are designed through our tried and tested process of co-creation to give parents of all backgrounds the knowledge and confidence they need to look after their own mental and physical health and to maximise their child's development. Baby Buddy is currently aimed at mothers and covers the period from conception to a when a child is six months old.
Click here to get to Best Beginnings' website.
You'll need to know about some key topics when you are pregnant, including healthy eating in pregnancy, antenatal care, decisions you need to make about labour and birth, coping with common pregnancy problems, and when pregnancy goes wrong.
You can find out about all these, and also read about your baby's development and your pregnancy week by week, by clicking on the links below.
You and your baby in pregnancy
Find out what's happening to you and your baby at:
Three weeks after the first day of your last menstrual period, your fertilised egg moves slowly along the fallopian tube towards the womb. Find out what happens next. You might start to notice the first signs and symptoms of pregnancy.
By now the face is slowly forming, and the eyes are more obvious and have some colour in them. You might still be feeling tired and sick, but this should clear up soon. Find out what else happens in the third month of pregnancy.
Read more about how much weight will I put on in pregnancy?
At 14 weeks, the baby is about 85mm long from head to bottom. If you have been feeling sick and tired, you will probably start to feel better when you are around 13 or 14 weeks pregnant.
Your baby's body grows bigger so that the head and body are more in proportion and the baby doesn't look so top heavy.
When you are 24 weeks pregnant, the baby has a chance of survival if it is born. Most babies born before this time cannot live because their lungs and other vital organs are not developed enough.
Your baby may begin to follow a pattern for waking and sleeping. Very often this is a different pattern from yours, so when you go to bed at night, the baby may wake up and start kicking.
By about 32 weeks the baby is usually lying with its head pointing downwards, ready for birth.
Your baby's bones are starting to harden now, even though the skull bones will stay soft and separated to make the journey through the birth canal easier.
The amniotic fluid now turns into waste, called meconium, in the baby's intestines, and the soft hair (lanugo) that covered your baby's body is now almost all gone.
Find out what to expect if you go overdue.