It's too hard to tell the extent of meniscus damage without an MRI.....
The fact that it hasn't healed with 1.5 months rest is a bad sign. I would get the MRI.
And I'm with Garrett... what exactly does "reinjure" mean? When I "reinjured" my knee my rehab was set back about a month or two. That's a reinjury. If there's a twinge of pain or something that only sets you back a couple days worth then that's definitely not much to worry about.