HHelen because she would become aware that you did it.
i think that all parents of a teenage daughter have to expect this.
Jonas So we come back around to the question, why 24/7 use, why a secondary shield? Is the aim here to prevent more than just pregnancy? Only @Hannah can say...
I'll be honest, the main goal is probably to prevent pregnancy, but I think @Hannah's parents also see other benefits and hope their daughter doesn't notice.