Small ovarian cysts don't usually affect your fertility. Most ovarian cysts are small and go away without treatment. In some cases, ovarian cysts need to be removed by surgery. If at all possible, only the cyst will be removed and your ovary won’t be. If you do have to have an ovary removed, you can still get pregnant if your remaining ovary is working normally.
However, endometriosis and polycystic ovary syndrome (PCOS) are conditions that can cause ovarian cysts and can also cause problems with fertility.