First of all, it is very important to know that 20% of all pregnancies do end in miscarriage. That is a huge number, and a very sad fact. Of course, with something such as miscarriage, there are no “rules,” no “facts” and no guidelines to go by. These numbers are just estimates and there are no guarantees. However, it is said that the risk of miscarriage is greatest in the first and second weeks of pregnancy, when you are not likely to even know that you are pregnant. This is called an early or chemical miscarriage, and can be the reason for the ‘false positive‘ you are seeing on your pregnancy test.