call your docotor's office, explain what has happened, your concern, and ask if you can make an emergency visit (at your doctor's office, not in hospital) at the earliest convient time of the doctor. if the doctor is not fully booked, and your child's condition needs immediate attention, you may see him/her the same day or the following day. however, it depends on how busy the doctor is and how ergent is your child's medical condition.
use your judegement on whether to visit the emergency room of CHEO or see your family doctor in one or two day. Hope it helps.