Midwife Chantelle Winstanley said one in five pregnancies can result in miscarriage, defined as the natural loss of pregnancy before the 24th week, during the first trimester.
"If a woman has a miscarriage during the first three months, it's normally a problem with the unborn baby," explained Winstanley.
Women who have a miscarriage during 14-24 weeks is less common, but is caused by a variety of issues including infections, problems with the placenta or a weakness in the cervix.
For women over 45, the risk of miscarriage is much higher.
"Even though you can't prevent it, you can reduce your chances of a miscarriage by cutting out smoking, alcohol, reducing caffeine and not misusing drugs," explained Winstanley.
"Women who are overweight are recommended to lose weight before pregnancy."
Winstanley said there are a lot of myths and misconceptions about what can cause a miscarriage, including lifting, having a stressful day, going to the gym and having sex. None of which are true.
Watch the video above to hear Winstanley discuss in more detail about the risk of miscarriage.