They are really common and usually cause no problems. I had them for years, and felt pain, but I have 3 children, so no problem there. It can take up to a year for a couple with no issues to get pregnant, so don't worry.
However, the cysts can cause other problems, if they don't go away. I had one not go away a few years ago and it got bigger and took over my ovary and I had to have the ovary removed. I think that's unusual, but just wanted you to know that if the pain is exceptionally more than normal, go to the doctor.