Although I don't have any experiencie or real knowledge about those pills, I would recommend to stop taking them.
Like some said, maybe you should cheek the pill and spit it out later; probably, the safest way would be trying to toss them in the trash while not in your house.
About the pads... In the worst of the cases, what I can think of is for you to go to a butcher's shop and ask for some blood or something and stain the pads with it, that in the worst case (to be thoroughly checked). If not, as they said, just wrap them with toilet paper.
Another thing: I'd say do not panic. Your parents are gonna be checking and everything, being strict and so... Probably just for the first weeks. If they think you're taking it and there's no problem with it, I doubt they're gonna keep their "intensity". Try fooling them to think that you're taking the pills.
Best of luck.
