My supervisor suggested my job might not be "a good fit" because of my health, is this discrimination?

Backstory: I've been working at an office job, full time for about two months. I'm a contracted employee, so I'm not an official employee of the company until 6 months where they can choose to extend the contract or hire me or not take me on at all. I am also an immunocompromised person so I catch infections easily. My supervisor knows this and this past week I was out 4/5 days for strep throat. I even brought a doctors note. I came back today and my supervisor emailed me the corporate attendance policy and warned me that if I was a regular employee of the company, I would face disciplinary action for my absence even though I was sick. She even said that "this job might not be a good fit if you plan to be absent frequently". This feels discriminatory because I can't plan when I will be sick and I ALWAYS bring a doctor's note. What do I do? I want to stay on with this company because it's stable hours, decent pay, and I actually really enjoy the work.

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