Anyone want to share?

Has anyone had multiple negative hpt's only later to find out they were pregnant? Do you have a regular cycle? Is age a factor? How long after your expected AF did you finally go in to the Dr? What did you ask? I'm beyond frustrated and have an appointment in a few days. I have heard horror stories of women being looked at as crazy when they knew they were pregnant but all hpts came up negative. Just wondering if anyone has any sort of input on this. Or suggestions on what to talk about with my Dr. Thanks ladies!