I just don't get it😢

I am very late for AF. She was supposed to come on the 1st and never showed. I've had very light spotting here and there this cycle that I've never experienced before and I continue getting negative tests OVER AND OVER. I'm on cycle day 39 now and I didn't test thus morning or yesterday but I'm going to tomorrow morning with high hopes for a BFP. This is driving me so crazy. If any of you ladies have experienced something similar and would care to share, PLEASE DO! (BTW: Glow moved my fertile window forward once I missed my period so now I'm not sure at all when I ovulated.) I know something for sure though, I've NEVER experienced spotting like this before!🤔