Line progression

Hi everyone. I’ve become a POAS addict since having a miscarriage with my first pregnancy. These tests have dried very similar and there doesn’t seem to be any progression. It’s possibly gotten lighter? The Boots tests seem to darken quite a bit outside the time frame and at first I thought I was definitely having a chemical because the 16DPO test was lighter. It wasn’t until I looked at a photo of the 15DPO test in the timeframe that I thought there might still be some hope as that was light in the timeframe too. Is this it? Am I having another loss?