Ay, ganyan talaga sometimes, sis, nine days delayed with negative PT can happen, lalo na kung irregular ang cycle mo or if you tested too early pa! A few of us sa group experienced this din, and turned out pregnant pala after a few more days. Best thing to do is retest after a couple more days, or mas better pa mag-check na agad sa doctor para ma-confirm nang sigurado at walang worry, kasi they can do a blood test na mas accurate pa, don't stress too much, maraming possibilities pa!