Upt kejap positif kejap negatif

Hi, saya nk tnye la.. sy ad cek upt pd wktu ptg lpas balik kje smlm, ad dua line, weakly positif.. tp ble cek pgi ni satu line je.. knpe ye? Bulan lpas pon jdi cmni, ble cek ptg smua positif, tp cek pgi -ve.. last2 sy priod bln lpas.. bln ni xthu la kot kne scam dgn upt lgi.. ad spe2 thu x knpe?#pejuang_garisDua #ingintahu #firstexperience #pleasehelp