according to your description your cyst could be functional cyst probably follicular cyst
which can seen in case of excess of estrogen
as it is of smaller size and containing only clear fluid no need to worry, you can just follow with serial ultrasound
examinations for around 3 months,
but if your bleeding is severe and troublesome, you can go for cyclic pills with your doctor's advice which will help in decreasing the bleeding during periods and also in treating the cyst.
you can continue your exercises and diet which may help to some extent in treatment, but just by natural measures these problem may not get cured completely.