Continuing Disability

Rosetta
I have a question ladies, my doctor put me out on disability until January, she offered to put me off an additional three months which means I won't be going back to work until the end of march. However, my job asked me when I was coming back and I told them the end of March. Should I be worried that when march comes I might not have a job? I'm just wondering, I know with being out on disability they can't fire you, but what if they come up with something else you know.