i'm a week late, i was cramping 2 days before my period was due but it never came. i've been dizzy off and on. my right nipple has been itching and burning but i took a test 3 days ago that said negative, still no period.? this never happens for me i always start the same time... Let me add that my last ovulation i used Preseed for the first time. has anyone had luck with it?