9 days late, BFN.

Good evening Glowers! I'm wondering if there is anyone with some advice on my situation?

My husband and I have been TTC for 6 months going on 7 months. In January I had some faint lines appear on cheapie dollar store tests, which slowly got lighter with each passing day that I would re-test (Hoping to see the line get darker) just to make sure.. as the lines were extremely faint, and I wasn't truly convinced. Eventually the lines went away all together and then 2 weeks later af came. I am still not quite sure what happened in January, but now here we are faced with another agonizing situation... I'm 9 days late, which I am generally very regular. Even in January, I hadn't actually missed a period, I just broke the rules and began testing early. But here I am now, testing after my period was due, like a crazy person. One a day for the past 4 days, and all negative. My poor husband must think I'm losing it, holding up the tests to the light, asking if he can see anything. I am wondering if anyone has been in this situation, where their period was beyond late, had negative hpts, and later got bfp? I don't feel pregnant or any different really, other than I do feel pretty tired lately, slight constant headaches and light low cramping. Any advice? Thanks!