Ahhh sabar ya, I know this situation is super stressful! Missed period + negative UPT boleh jadi beberapa reasons, hormones still adjusting after chemical pregnancy, stress, or timing issue lang dengan cycle sis. A few of my mum friends went through similar situations and mereka suggest tunggu 3-5 more days then retry, sebab timing UPT is important (best pagi-pagi with first urine). But honestly, since you had a positive result before, best you see your doctor or do a blood test to be sure, they can check your hCG levels yang lebih accurate daripada UPT je. Lepas tu you'll know exactly what's happening with your body! Jangan worry dulu, try test again in a few days and book that appointment, okay?