How do I tell my mum that I've had sex!?

Well I just feel that I shouldn't be hiding this type of stuff from my mum, but I just feel it would be easy yet hard to tell her because I don't want her to be so disappointed in me, and I don't want my dad to find out either, but I feel more comfortable talking to my mum about it but I don't know if I should I don't want it to get to the extent of being kicked out the house 😔 someone please help me and I'm only 16