Wa'alaikumassalam! Samar gitu memang confusing kan, tapi honestly DPO15 dengan dua garis (even kalau samar) usually means pregnant dah lah, the hormone is there, just maybe belum tinggi sangat lagi. A few of us tried UPT around that time and semua dapat samar jugak, then a few days later jelas. Tapi untuk confirm proper, better la you go see your gynae or do a blood test, HCG blood test will give you the definite answer, especially since you're at that early stage lagi. Jangan stress k, sabar sikit lagi maybe test lagi in a few days or go straight to the clinic je, so you don't have to worry. How are you feeling otherwise?