Surgery for ovarian cyst while pregnant

16w3d, found a 6cm cyst at my 7wk us, grew to 10cm by my 12wk us. Followed up with a gynecological oncologist, said its benign and only fluid filled but if it grew they'll want to surgically remove it by 18 wks. Anyone have the same experience? I've read this surgery is safe while pregnant but of course I'm going to worry.