How big do they need to be to reduce chances of pregnancy?
Research has shown that any cyst 10 mm or larger is associated with a lower chance of getting pregnant. In a study on women doing IVF, those that had a 10 mm cyst at the beginning of a cycle had half the pregnancy rate of those who had no cysts (and the groups were equal on all other relevant characteristics). So it does not eliminate your chances of pregnancy, but it does sharply decrease them.
