4 Days Late & BFN?!

So frustrated & confused -- AF was due on the 24th, I have tested every day since then and all have come back negative. Has anyone dealt with this? We are TTC #1 after a miscarriage over the summer. My cycles have been completely off since then, and I can't make any sense of it...I also have zero symptoms of either PMS or pregnancy (normally irritable w/cramps before AF), I just feel totally broken...