I tested last night 7dpo and this morning 8dpo (I know WAY too early?) anyway this morning I noticed the very thin 2nd…

I tested last night 7dpo and this morning 8dpo (I know WAY too early?) anyway this morning I noticed the very thin 2nd line but assumed it was indent/evap because of how thin it was, but I just checked last nights test and has same thing in the same place! Are these super common to have indents like this? (Both tests pictured)