Simply. My Cycles are always 26 days. With the odd spotting on day 25 with 4-7 day bleed. On CD25 I got really light spotting like had I not been expecting my period I wouldn't have noticed it but it was literally like one smear and then that was it. (Side note: I was sick, Nausea and vomiting CD25)
Now CD31 (5 days late!) I took a HPT (cheapy IGA test) and it was negative. I have two children, my son I found out at 6 weeks because he was a surprise and I wasn't tracking my cycles at all. I had hyperemesis. My daughter on the other hand I found out at 9DPO with FRER and hyperemesis started at 8 weeks.
Is it possible that I could be pregnant? Surely the HPT would have been positive by now but I have never had a late period other than being pregnant :/