Ive officially gone crazy

So I am 12 dpo and I’ve been testing with fmu every morning since 9 dpo. All I’ve been getting are STARK WHITE negatives. I read somewhere that if you open up the test you can maybe see a faint line that wasn’t dark enough to make it visible through the front side of the test. So I broke my test open from this morning and I swear I see the faintest of faint lines.

Please tell me what y’all think. Is this the very faint start of something or am I just seeing the indent from the back side or what?