Hello As you mentioned that there is a cyst 2x4 mm on the right side ovary. Amenorrhea ===one year. Gaining weight Thyroid function test are normal . Took Homeo treatment for cyst . Still you are having cyst , as this is clearly in scan as well amenorrhea and gaining weight are an indication that these symptoms are due to cyst. Cysts are often caused by hormone changes . Using birth control pills can sometimes help regulate hormone levels , so that the cysts can be taken care of. So visit you gynae as she will likely to prescribe birth control pills for this cyst and amenorrhea . Few doctor also prescribe metformine for this type of cysts. Once you stop pills , as long as there are no medical concerns , you should not have any problems with future conception. Hope this will be useful for you.