My mother found my used pregnancy kit

I'm 18F and recently shifted to another city , two years ago I brought a pregnancy kit out of curiosity and test it obviously it was negative and I kept it in my diary folder cuz I want to show it to my friend but dumbass me , i totally forgot about it and few days ago she found it . Also she found some letters and notes form the boy I used to like , she didn't said anything yet cuz she's was waiting for me to come home and today morning I did , she is out for work I don't know how to handle this situation, my dad is super strict they're gonna think I had sex with someone 😭