When should I ask my mum!!???

Hi, I'm 16 and I want to have sex with my boyfriend and I know he wants it so bad too but im really nervous in case anything went wrong. I would feel better if my mum knew I was doing it so I could speak to her if anything went wrong and maybe she could get me the pill....I want to talk to her about it but I am way too scared , is 16 still too young do U think? Should I wait longer? ( I have been with my boyfriend for a year and a half ️btw)