Thanks for writing.
I can’t give you any specific information as I don’t know your personal situation e.g. where you were born, where your parents were from etc… What I can do is give you some general information and what to do next.
If you were born in Canada and your mother lived in Canada most likely she would have been screened for infections during the pregnancy. In this situation I would not be concerned.
If you were not born in Canada or a country with a similar standard of medical system or your mother was from another country or did not have access to medical services in Canada, there is a chance in these circumstances that something could be passed to the child without someone knowing. Certain infections can be passed from mother to child during pregnancy and delivery, or by being passed from having unclean medical procedures done in other countries. Even if this did happen in your situation, I would think that you would have been tested on arrival in Canada or during the adoption process.
Another thing to consider is that there will always be a certain amount of unknown depending on your circumstances and it can also be difficult trying to get medical records from that period of time. It may just be easier to go and get a blood test done for HIV, syphilis, hepatitis B & C. You could also see your family doctor and ask their opinion as they would know the most about your medical history.
Hope that helps. Feel free to comment below or ask another question if needed.