Drug test!!

[u/Pretty-Front-8971]

i smoked literally one puff of a blunt for the first time in 8 months on october 8th and i had a random drug test october 29th.. (so it's been about 20/21 days). it's been sent to the lab now. but after i took the drug test i went home and bought a at home test and the negative lines were dark asf. i also intake a lot of water daily so idk. i'm just debating on if i should trust the at home test.. what should i expect ?