What’s going on

I’m 12 days late, had spotting for a good 2/3 days instead of my period. After 2 days I Took a test and I had a Faint positive. Waited another 2 days and STILL had a faint positive.

Right now I took a 3rd test and didn’t even get a faint. I had a straight “Negative” line.

What is going on ? I was already getting excited. Has anyone ever been through this ? What are your thoughts?