Aw, nakakagulat yan talaga, mommy! Pero please go see your OB right away, this really needs a doctor's check-up to make sure you're okay, lalo na may bleeding. Three positive tests plus spotting needs proper investigation, hindi lang guess-work.
A few of us moms went through confusing situations din like this, at ang best thing really is to get checked immediately para ma-rule out kung ano talaga ang nangyari, whether it's hormonal, or something else. Don't wait on this one, promise? Your health comes first. Wishing you answers soon, sis.