It is really important to understand that in most cases, we just don’t know why miscarriage occurs, and it is unlikely that you have done something to cause a miscarriage.
Research tells us that around 50-80% of miscarriages result from random chromosomal abnormalities, which occur more frequently in the sperm and eggs of people over the age of 35. Women who experience miscarriage due to a random chromosomal abnormality have a high chance of a later healthy pregnancy.
Below are links to pages that discuss the things research has shown to increase your risk of miscarriage, and factors you can undergo testing and investigations for.
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Risks for Miscarriage
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Testing for Miscarriage