Nice sized cyst..

Hey ladies!...well i just left the hospital due to pain in my right side ...Dr. at the hospital said I have a nice sized cyst on my ovary...I just turned 28 weeks today I was just wondering if any of you ladies have experienced this??...Dr said most of them go away but if it gets bigger they may need to operate...i'm a little worried now...baby was fine though which kind of eases my mind.