POSITIVE & NEGATIVE

Hi mga my. July 24,supposedly ang menstruation ko, July 25 ako nag karon until 27. July 29, we "do" ni LIP and then madaling araw nag spotting ako same nung August 1. Plano ko na sana uminom ulit kagabi ng panibagong pack ng pills, so naisip ko mag pt muna at yung result nya is positive. Then nag try ulit ako this morning negative naman. Please give me some insights regarding this matter. Thank you.