Sabar jangan risau, 3 hari delay tu memang normal sometimes especially kalau stress atau routine berubah! Tapi since you had those cramps, back pain and nausea 2 weeks before, I'd say go jumpa doctor to clarify, better safe than sorry kan, sebab symptoms tu bisa jadi sign of something atau pregnancy itself. A few mum friends I know pun diorang check awal when they get that kind of combo, so boleh je dapatkan peace of mind. Do a pregnancy test dulu or check dengan doc, they can advise you properly berdasarkan your full history.