why am I late, but no BFP 🤔

So frustrated. According to glow I should of started the 31 st which would of been a 36 day cycle. Weird but whatever. Every other app says 28-29th. So here I am 5 negative pregnancy tests later and no period. I wish I would just start my period if I wasn't pregnant. I don't get why I couldn't be getting a positive if I was pregnant and why I am so late if not. I am always very regular with a 32/33 day cycle. I have been taking first signal tests but bought a first response this afternoon. 😩 guess I will wait till Sunday to test again but this all is driving me nuts lol.