Would you consider this a chemical?

C

So I'm 12dpo and AF isn't due for two more days. I got this on a frer at 10dpo but negative on a cheaper brand today 12dpo.

If Af arrives would you consider it a chemical or an indent line? Would like to know as hubby's sperm motility might be bad due to strong meds so if it was a chemical then perhaps that is a sign that one determined swimmer made it there? Orr I could still be preggo just need another sensitive test?

Has anyone had indents on these?