@scaredguy,
Are you a doctor? I'm getting the feeling you're not.
So stop depending on drugstore HIV tests (which you clearly don't store well) and instead use condoms, which are actually proven to help prevent HIV.
Get tested often by an actual medical professional if you're sexually active with multiple partners, use condoms every single time, and keep yourself out of situations where you are so concerned about your potential partner's HIV status that you make them pee on a stick.