Aww, totoo yan, maraming mamas sa amin nakaranas nun, delayed period pero negative pa rin ang PT, tapos positive lang after a few days! Ang body changes mo like breast tenderness, nausea, or fatigue ay pwedeng maging signs talaga, pero minsan ang hCG hormone pa lang ay low pa to show up sa test, especially kung very early pa ang possible conception. I'd suggest retesting in a few days or better yet, mag-blood test na sa clinic para accurate talaga, mas sensitive ito at makikita agad kung pregnant ka man o hindi, tapos may peace of mind ka na!