Late period

I'm officially 2 days past my expected period, but I tested yesterday and got BFN. But I have a shorter luteal phase so I think that might contribute! I'm now 8 DPO. For those with a shorter luteal phase, when were you able to test and get a BFP? I'm super regular in terms of my period and cycle, so I think this may be it, but I don't wanna go crazy with the pregnancy tests and possible false negatives! Also does it really matter what time of day I take a test?

***Please no comments about how there is something wrong with me because I have a shorter luteal phase- I'm set and that wasn't what my question was about***