Chemical? Or just indents?

K

So a few days ago I got a very faint line on an FRER at 8dpo. Two days later got another line that was slightly darker, but still pretty faint. Later that day I started spotting, and it eventually became AF like bleeding. Would you say this is a chemical? Or do you think maybe these lines are just indents? Just wondering for record keeping honestly haha.. thanks!

8DPO

10DPO