Hi - I don't want to alarm you as much as alert you to the idea that you're in a foreign country without any legal status. If you come to the attention of the CBSA their perspective will centre on you being in contravention of Canada's Immigration Act and their responsibility to enforce it.
If you can demonstrate that you're trying to fix your status, and not be here without authorization (legal status) then this is a good thing. If you're peddling about without any visible evidence that you're not just ignoring Canada's laws then the grounds for arrest could be your unlikeliness to appear for any further action.
A person can come to the attention of the CBSA in any number of ways, so a jealous or malicious person who gets wind of your status is a common source of CBSA statistics. A small car accident, your partner's friends and/or enemies, the jerk next door - ya just never know.
If you're in any country without status you can end up in detention awaiting removal, Canada too.
Good luck