Eh, ni normal je actually! Urine concentration memang lebih pekat malam sebab kurang air, so the line jadi lebih terang, pagi bangun baru minum air, urine dah lebih encer. Tapi kalau you're worried pasal accuracy, better do a proper test with your doctor or pakai kit yang clearblue sebab sometimes line darkness boleh confusing, especially kalau positive dah; what matters more is the line ada or tidak, bukan how dark it is. Congratulations kalau positive!