Ai, 12 hari lewat period memang bikin stress kan! Kalau UPT negative tapi period tak datang lagi, boleh jadi HCG belum cukup pekat (kalau pregnant memang) atau hormone imbalance ja, memang ada cases macam tu among my mum friends jugak. Honestly, better go see your doctor for a blood test (HCG test confirm betul-betul) and check hormone levels, tak perlu tunggu lagi sebab they can give you answers yang proper, plus eliminate other possibilities macam thyroid issues. Jangan stress dulu, tunggu hasil doctor yang definitely akan clarify!