The statistics regarding miscarriage vary widely depending on the source. Here are some of the basic numbers.
Almost 20% of pregnancies end in miscarriage, with the majority occurring during the first 12 weeks.
There is a 75% chance of miscarriage in weeks 1-2 of pregnancy, when you do not know you are pregnant.
There is a 10% chance of miscarriage in weeks 3-6 and this number drops to 5% during weeks 6-12.
During the second trimester the chance of miscarriage drops again to 3%. After you’ve reached 20 weeks gestation, it is no longer considered a miscarriage.
For repeat miscarriage the statistic are as follows:
If you have had a miscarriage during your first pregnancy, your chances of another miscarriage are 10-13%.
If you have had one or more live births and one miscarriage your chance of another miscarriage is around 10%.
There is a 40% chance of a repeat miscarriage if you have had two pregnancies and two miscarriages.
The chance of multiple miscarriages is lower, at around 13%, if you have had one or more live births.
If you have had three pregnancies and three miscarriages there is a 60% chance you will miscarry again. If you have had four miscarriages with no live births your chances of a healthy pregnancy drop to 0-5%.