Late Positive Test?

Hi Everyone!

Has anyone gotten their Bfps late? I didn’t get mine until 13 days late and it was faint. Took about a week for it to be darker.

Nurse on the phone said probably late implantation/ovulation etc.

Anyone in the same boat? Did it affect your due date? I feel like I’m not as far along as they think. First appointment Monday, I would be 9 weeks.

Thanks! :)