Hi, Were you adopted?
If so - You can now - obtain your Adoption Papers - from the Govt of Alberta. Your Registration of Birth - may show if your mother had other children previous to your birth.
Since you were born in 1975 things were much more open in those days than previous times. Whatever the circumstances -at the time - perhaps your parent/s or siblings are also searching for you
Govt of Alberta - has a registry where Parents/children/siblings - may be able to find one another
Check with the Provincial Archive re Hospital Ledger -
this may have some information that may be helpful.with name/s of parent/s
Cheers & Good Luck, Stella