Golf ball size is still quite small but I guess they are concerned it may grow too fast.
No they haven't yet she just said it is the size of a golf ball. I go see the doctor that specializes with cysts during pregnancy
Welcome to the community. I am sorry you are having to deal with this especially during pregnancy. Did they even tell you the size of the cyst? They should be explaining everything to you. You can request a copy of your medical records especially the ultrasound reports of the cyst. They have to provide them to you although there may be a small fee.
Please post back when you know more.