Sayang, I understand ni confusing and stressful betul! But honestly, dengan hasil UPT yang inconsistent macam ni, you really need to see a doctor or go to clinic/hospital ASAP, they can do a proper blood test (beta hCG) which will give you the actual answer, bukan just satu line or dua. Tompokan coklat, UPT yang unclear, then positive, then negative again, ini semua benda yang kena check with proper checkup, betul tak? Don't stress trying to interpret the lines sendiri lah. Clinic boleh confirm dalam 5 minit je with blood test, and if you are pregnant, they can also check if everything okay. Go today or tomorrow if you can!