Sabar je lah dik, these things happen! A few of my mum friends pun pernah delay macam tu, sometimes stress, changes in routine, atau hormones pun boleh affect cycle, so don't worry lagi. Kalau terus-terus bermasalah or you're concerned, better check dengan doctor untuk peace of mind, tapi usually it settles down on its own. Fingers crossed next cycle datang on time!