13 dpo fainter line than 12 dpo

Jess

Hi all. Posting because I’m very worried.

Yesterday at 12 dpo I got a very obvious second line that was not dark, but definitely there. Today I tested at 13 dpo and the line was very very faint.

I tested with fmu and afternoon urine and both results were the same. Very very faint.

Is this normal or signs of chemical?

Attached is my 12 dpo test