Sayang, ini betul-betul kena pergi hospital atau klinik TODAY, jangan tunggu lagi, okay? Brown spotting + positive UPT tapi scan tak nampak apa-apa after just 8 months postpartum c-section ni memang kena check urgent dengan doctor, bukan online advice je. A few of my mum friends pernah ada similar situation dan they all needed proper ultrasound or blood tests to check what's happening, bukan sekadar UPT. Please go to A&E or call your gynae clinic sekarang, okay?