do lesions just keep developing?

Hi could someone answer this q please? I am newly diagnosed. Optic Neuritis in March then referred to neurologist. Saw neurologist in August referred on for more mri,lumbar puncture and bloods. Confirmed m.s three weeks ago. Was told I had 2 brain lesions in March now another two since August mri. Now being referred for treatment. I take it this is the way it’s too going to go now with more lesions appearing?