Opinions?

So. I have three different apps I use to track my cycle, one app says Im one day late and should take a PT today, another says tomorrow is when AF arrives and THIS app says AF isn’t due for five more days.. my dr said she wants me to test Wednesday and my SO just bought me 2 tests and I’m super nervous. My questions are, why would my apps be so off when I log the same thing on all of them? And should I test today, wait till the morning like the dr said or wait till Glow says I’ve missed my period? 😭 I know I’m making this way more stressful than it needs to be but I can’t help it 😂😩