I Have Hurt My ACL On My Left Knee In

I have hurt my ACL on my left knee in some way but not sure if its just spanged or torn. I have hurt it 3 differnt times in the same place playing different sports. I have pain for about 4-7 days after each time and its uncomfortable to walk, but than the pain totally subsides. Only if I squat down as far as I can to the ground with my butt against my ankles do I feel the discomfort. Does it sound like a tear or a sprane. I dont have money for MRI