I have a cycle that varies 26-28 days. I have tried the ovulations kits and the past two months show negative on all days... I used the 28 day cycle dates on the box instructions. Both tests I did day 11-16 with all negative results. I have normal periods, though every other month my period and cramps are worse. Due to unrelated medical appointments (physical etc) the dr. did pregnancy tests (blood) and they have been negative, so I know that I am not pregnant. Even though the ovulation test kits said negative, my husband and I still had sex anyway... What is wrong with me? I have an appt at the end of the month for a regular PAP appt. and am waiting to find out if my insurance will approve some fertility tests.