Eh sabar dulu, sometimes period memang boleh delay walau test negative, stress, hormonal changes, weight changes semua boleh affect timing, so jangan panic dulu lah! A few of my mum friends pun pernah experience ni, period datang a few days after the negative test. But kalau dah 5 hari past expected date and still nothing, better check with your gynae to rule out any hormonal imbalances or other reasons, just to be sure okay?