My LMP was Sunday, 4/11/10 and I have 28 day cycles. I was due this past Sunday, May 9 and it was a no show. I did take a pregnancy test on Friday, May 7 (2 days before I was supposed to start) and it was negative at that time. Tomorrow will be 6 days of being late... Now question is should I retest now, in the morning, or sometime next week? Has anyone ever tested a few days before period due and it show negative and then positive after missed period?