Advice

I’m about to start training for an European airline and have to partake in a psychoactive test (urine drug test). I have the prescription for an anti anxiety medication as an SOS and took one late last month because my dad has been in the hospital for the last month battling cancer and I fell down an anxiety spiral. I’m not sure if I should disclose this prescription medication and let the airline know or just do the drug test and hope for the best. I know a positive drug test will definitely kick me out from the course but I’m scared they might also kick me out for “needing” this medication. Can anyone advise me on this matter?