Ottawa's airport website lists the gates for both arriving and departing flights - so you can work it out that way. Today's YYZ-YOW (446) was cancelled and it appears it's the same plane since the YOW-YYZ (451) was also cancelled. Also both were scheduled to use gate 17. So looks like you're in the clear.

Same crew might even operate it - you might get puzzled looks when you reappear on the same flight!