Period is 2 days late, still BFN!

So I got my period on Oct 31, and since then I’ve been off the pill because we decided to start ttc our second. My period lasted maybe 3-4 days and then I had SUPER light spotting from CD 13-15, by spotting I mean super light pink, only when wiping, it never even made it to my underwear. I assumed this was maybe ovulation spotting. Then on CD 18, I had 2 dark brown clots, not sure why but it never continued. My period was due by latest I’d say is yesterday, maybe today but I have zero signs of it coming. I had cramping over this past weekend and a couple days before so I thought it was going to come early or it was just on its way and nothing yet. I’ve taken so many tests, mostly cheaper ones, not sure if I’m seeing a faint line or if my eyes are playing tricks on me. I’ve also taken a FRER last night (15DPO roughly) and I thought I seen something faint but I’m not too sure. I figured if I was pregnant it would be coming out pretty dark or even standard by this time. Is it to be assumed I’m not pregnant at this point or is it possible to still be? I’m unsure because in my last pregnancy I knew days before my expected period, and in a pregnancy that ended in loss I knew days before as well! I’m just worried that if I am maybe this pregnancy isn’t viable 😢