How often do neuros say it sounds like MS before testing and are then wrong?

Everybody seems to be shocked that my neurologist and GP are both suggesting MS while still waiting for an MRI, apparently they wouldn’t say it if they weren’t pretty sure. I’m a 22 yo woman with pretty much every MS symptom there is, worsening steadily over the last couple of year, with a dozen other health problems. The more I look the worse it looks, so I’m grasping at straws here looking for good news.