Beyond confused

Deb

So let me start by saying I'm 10 days late for AF and I've taken about 8 tests and all but 1 have been negative. Ever since I've hit puberty I've NEVER missed a cycle except for when I was pregnant with my son in 2017. Idk what's going on and I'm trying to figure out why out of nowhere I have no cycle. I have an appointment on Wednesday but I can't wait that long. I just took a test with fmu and still nothing. Help?

Here's from today. (My last test taken)

Here's from last Saturday (my only positive)