Sabar ye nak... 3 hari lewat dengan gejala tu memang bikin harap, tapi UPT murah kadang kurang sensitive especially awal-awal lagi. A few of my mum friends dapat negatif dulu lepas tu positif within the next few days, so mungkin you're just testing terlalu awal pa. I'd suggest wait another 2-3 hari and test again dengan urine pagi (yang paling pekat), or better yet, go see your doctor terus para confirm properly and get proper advice based on your cycle. Doakan yang terbaik untuk you, semoga rezeki datang!