Short Term Disability?


First off, I'm just looking for advise or guidance because this is a first for me and I'm completely lost.

I live in Ontario, am 26 weeks pregnant, and for the past 2 months I've been experiencing lower back pain (sciatic). It has gotten progressively worse to the point where I cannot physically walk. I am a project manager for construction so my job requires me to conduct site walks and is very stressful. My boss also wants me in the office 2 days a week (I have a 4hr commute each day which causes debilitating pain). My question is, does this qualify as short term disability?