Aihhh confusing betul kan! Positif lepas tu jadi negatif memang boleh happen, sometimes it's because the hormone levels still very early and fluktuate, or the second test kena affected by diluted urine or timing. Since you're planning for a baby, best bet is go see your doctor and do a blood test (HCG), that's way more accurate than UPT and will give you the clear answer whether you're pregnant or not. Jangan stress dulu, just get it confirmed properly, then you know what's next