A chemical? Help please

On Saturday, I took a frer with fmu and got what I thought was a vfl (the first picture below). The next morning I tested again with fmu and a frer and got a bfn. Same day I started spotting which turned into a normal period flow, so I just assumed I was out. Fast forward to this morning, and for some reason I decided to test again. I almost feel like this line is darker. Is this a chemical? Should I call my dr? The last two pictures are from this morning