If your doc didn't get concerned about the cyst, you shouldn't either. Regular simple cysts go away on their own. Complex cysts (ones that also have a solid component to them) are the kind that need further evaluation.
Simple cysts won't get in the way of conceiving either. Most women get them and don't even know it.
It depends on what type of cyst, how many there are, and if it is growing or stagnant. There is no simple answer:/