Evaps

I’m 7 months postpartum and my husband and I are wanting to have baby number 2 soon. We’re not preventing and haven’t been this whole time, but I haven’t gotten my period back yet. I was having some symptoms so I had been taking some tests and I’ve gotten 4 evaps on 4 different frer tests and two faint lines on two cheap blue dye tests. The thing that’s really confusing me is that on the frer tests, the lines come up a day or so after taking them so it’s obviously an Evap, but each day the Evap line is darker. So the 7th was my first Evap and then two on the 8th were darker, then the 9th was super dark and obvious. On The cheap blue dye ones, a line came up right away last night when I took it then a darker line came up this morning but after the 2 minutes.

So I’m just so confused because I’ve probably taken over 30 frer tests throughout ttc with my daughter and then right now, and these are the first tests that I have ever gotten an Evap line on. They’re from different boxes too. Has this happened to anyone else?

Here are some pictures of my evaps