Maybe a dumb question but bc I’ve been on the depo .. i haven’t had regular periods just spotting…

Maybe a dumb question but bc I’ve been on the depo .. i haven’t had regular periods just spotting throughout the months & period symptoms . Anyways I’ve been on antibiotics and it cancels out the birth control . I’m wondering if I’m pregnant or if im just feeling these nauseous symptoms from the depo bc I’ve experienced this before and i wasn’t pregnant . Just paranoid😂 when’s a good time to take a test considering i can’t depend on waiting for a period ?🤔