A miscarriage is the loss of a pregnancy during the first 23 weeks.
The main sign of a miscarriage is vaginal bleeding, which may be followed by cramping and pain in your lower abdomen.
If you have vaginal bleeding, contact your GP or midwife. Most GPs can refer you to an early pregnancy unit at your local hospital straight away if necessary. You may be referred to a maternity ward if your pregnancy is at a later stage.
However, bear in mind that light vaginal bleeding is relatively common during the first trimester (first 3 months) of pregnancy and doesn't necessarily mean you're having a miscarriage.
Read more about the symptoms of miscarriage.