I was due on Sunday and still nothing spoke to my dr yesterday and she said to wait a week and test again and she said she wouldn't be concerned until you miss more than 1 period as it's common to miss one!
I was under the impression most tests are accurate the day of your missed period?! What type of test did you use? Some are more sensitive than others. Any possibility your ovulation was delayed? in Illness/stress if the body doesn't think you're ready to ovulate it holds off til a better time in the month. Late ovulation can result in late af. The other possibility is you didn't ovulate this cycle
I think I read somewhere, and that somewhere may have been fertilityfriend, that 95 percent test positive by day 17 after ovulation (to know when his is you would have to have some idea when/if you ovulated)... also I guess it depends on what time of day you test/ how dilute the wee is.
I have just started my period 53 days after my last one, usually have regular 32 day cycles but think ovulation must have been delayed for me. It's incredibly frustrating! Good luck, and let us know either way x