Eh sabar dulu, 6 hari delay dengan spotting + cramp + breast bengkak tu memang boleh jadi hormonal changes before period datang, tapi sebab UPT negatif, boleh jugak test terlalu awal atau false negative. A few of my mum friends yang delay juga experienced spotting lepas tu period datang je, so jangan panic dulu! Since you're worried, better check dengan doctor untuk confirm, maybe they boleh scan or do a blood test yang more accurate, sebab kalau really pregnant, hormones will show up clearer in blood work compared to UPT. Sabar ye, and do see your gynae soon to put your mind at ease!