Test lines not getting darker

Has anyone had this? I took a test at 12, 13 and 14 dpo. Alll SO faint you can barely see them. Before that, even the first response was negative. I can’t take FR anymore because they have given me wayyy too false positives. I also can’t get to the doctor for another 2-3 weeks.

12dpo

13 dpo

14 dpo

Also 14 dpo but I didn’t check it right away and it say for 6 hours so it’s invalid

Has anyone had this happen? I hope I’m not miscarrying