I assume you had to provide medical results before you came to Canada to get your study permit, is that correct? That would explain why there was no restriction on that permit.
Your new permit generally won't allow work in public health sensitive environments like schools and hospitals unless you provide medical results upfront.
Is your study permit (that presumably allows you to work, with some weekly work hour restriction) still valid?
In that case there may be a chance you are still able to work as specified by the conditions on your study permit, until that one expires.
If you indeed have both a valid study and open work permit your case is however more complicated than most. Regardless, I would definitely call IRCC as soon as possible, as you risk illegally working.
Thank you for your replied. I’m still in school now and yes I summited my medical when I obtained my study permit. My study permit is still valid till August 2019 and my work permit is going to expire same day as my study permit. But, my current job have nothing to do with school and hospital. But still under health care, It’s a residential support worker and I don’t know if that restriction apply to it