drug testing?

hello, i am 17 years old and recently my dad caught me smoking weed. he wants to drug test me in about 20 days. i smoked at the beginning of december and took a couple hits off of a wax pen last wednesday so about 8 days apart. i’m scared i won’t pass and i’ll get in trouble for smoking again even if i haven’t, because i’m not smoking again for a long time. should i be ok? i didn’t smoke for about 4 months before i started again. i drink a good amount of water and my metabolism isn’t super fast nor super slow. thanks

EDIT: when i smoked at the beginning of december it was only one bowl pack before i went to school.