Should i be worried if i have an ovarian cyst?

Depends on its size : Consider getting a pelvic sonogram to better understand the cyst.

If MRI imaged the ..: Whole cyst, it is 3 cm or smaller, and there is nothing suspicious on the mri, then it is likely physiologic and "normal". If the whole cyst was not imaged, or if on MRI there is any question about it being simple or benign, then a trans abdominal and a trans vaginal ultrasound should be obtained to fully evaluate it. Statistically, it is likely benign since simple cysts are very common.