All birth control comes in slightly different packaging. Just use a package that no other brand uses. You could even go extra on making it cute and not so tamper proof (since it’s not real drugs) and then anyone who takes real pills would be like “wtf these aren’t my pills?” Idk I take like 10 different prescriptions and I don’t think it would actually be that easy to just swap them out because when the pharmacy changes manufactures I notice that shit!