Pre employment test

Hello, recently I moved to Saudi Arabia. I Had to do my pre employment medical and my urin was tested for drugs. Before coming here I took intramuscular injection for back pain which is very common and legal in my country. Naklofen, deksamethazon and diazepam. It seems to be a problem with my medical now cause probably they detected it through urin and as I read, it can stay in urin for weeks (diazepam). Can they deport me Because of that and can my medical be failed? What should I do in this kind of situation? I didn’t know this was banned here nor did I know they check for it in medical.. im not a chronical user of any medications I only take it while I have a back pain or smth Like that…