12dpo bfp but worried line should be darker?? Helppp!

Je

Below is a picture of my bfp at 12dpo (not FMU) I just want to make sure my line is progressing for me to be at 12dpo is this good? I just want to make sure everything is ok being that my first appointment isn’t until 3/29

My first bfp at 9dpo again I know the line is progressing but should my line be darker at 12dpo?