Hii I Am Age 26.10 Months....my Weight Is 59 Kg...at

hii i am age 26.10 months....my weight is 59 kg...at the month of dec 2015 i did a normal sonography check up which showed up a right ovaraian cyst measuring 4.2 * 3.9 * 3.1 cm ....in the month of jan after my cycle again sonography was done...in which the cyst was cleared ....but still my dr has suggested to take deviry for 3 month from day 16 to day 25......i did take in the month of jan 2016....my cycle came regular in the month of february...but the flow was very less...as compared to the history...i just want to confirm why did it happened so....and should i continue to take the medicine for this and next month also