How many weeks?

Shonise • I'm 25 years old. I have a 3yr old daughter and a 9yr old son. I'm happily engaged as well! Nd now pregnant with my 3rd!
How many weeks do you have to be to start going to your ob/gyn every two weeks?? I'm 22wks4days now I will be 25wks when I go nov 3rd which I go every four weeks. Hopefully it tones down to two sooner or later!!😕😕😕