1st Pre-Employment Drug Testing w/ Quick Fix..

So I landed a really great job unexpectedly and I'll be taking my pre employment drug screen/phsyical tomorrow morning. I have already purchased my Quick Fix and how to prepare it before your testing, but I am very skeptical on where I should hide my quick fix. Being a woman, I would think breasts, but while recieving a phsyical from a doctor I feel that is too risky because he will be listening to my heart beat. I felt that putting it in my crotch was the most effective thing because the doctor should not be touching my private areas for a pre employment phsyical (SHOULD HE?!) I am also nervous the doctor may ask me to wear a gown, not sure if this holds true for a pre employment physical, but if so I am not sure if I should keep it in my crotch area or hide it in my shoe until the doctor comes in, but that also risks the urine staying at the right temperature. If everyone thinks I'm a-okay putting it in my crotch area then I'll go with it! I have very tight fitting girl boxer briefs that cap off around my thighs so the bottle will not slip out. I have always got completely clean for jobs in the past, but this time it was just very unexpected, so this is my first time using a substitute! If anyone has any types of tips or pointers it would be greatly appreciated because I go for my testing tomorrow. Thank you everyone! <3