First appt they found a cyst on my ovaries

My doctor said its nothing to worry about and that in time will go away by simply the fluid leaking out give it time. He said that this is what is causing some abdominal discomfort. The baby is safe and doing great but is just painful for me. It still worries me even after the doctor assured me it is not harmful. Anyone else had or has cysts caused by pregnancy? Did they eventually go away?