What is happening here? First photo is my line progression from 6-7 dpo (I tend to implant early), and it got stronger for a couple days, then got lighter starting around 9 dpo and all tests went negative or close by 12 dpo. I figured it was a chemical, but I had one last month and my OB said that 2 chemicals in 2 consecutive months is really rare (apparently like 1%), so she told me to keep testing. I’m on my period day, CD 14, no period in sight, and my tests tonight all look like the second set of photos (multiple brands and tests to make sure—all taken within the time frame over the last hour). Hubby said maybe dye run, but dye runs don’t look this thick or defined and they don’t happen on different test brands concurrently. I’m so confused. Why would my tests go negative then positive again?