Firstly thank you all for the quick and informative responses.
Nobody has actually ASKED me to get an MRI, but I want to do it myself as I am worried about my back.

My lower back has been aching me for about 2 weeks now, and yesterday the upper right side of my back starting hurting.

I visited a Doctor and he instantly told me that it is NOT a slipped disc, and is just a muscle spasm as the pain doesn't extend to my legs, though I still want to be certain as I want to start working out again, but I don't want to mess with my back if I shouldn't.
And he said the upper back pain was also normal, and not related to a slipped disc whatsoever.

Thanks again!