should I tell her?

Tiana
Hi ladies,
So yesterday I saw my guy best friend and caught up with him for the day (he took my vs before this happened) and we watched about 3 movies and then when we got to the third we ended up having amazing sex 😍 anyways my mum picked me up after and said "why do you smell like guy sweat, was he hugging you?" And I just said "I don't know..." I think she secretly knows I've had sex but idk if I should tell her or what! She scares me when she's mad, so I'm not sure how she'd react, and who knows if she'll let me see him again!