Could I Still Be Pregnant?

I am currently 13 days overdue for my period. I tested about a week ago and it was a BFN. Could I still be pregnant? I am having my fiance bring home another test after he gets out of work just in case but is it even possible?

Update:

I tested last night when he came home and it was another BFN. Tested this morning and once again it looks like a very clear negative to me. I'm so frustrated and sad because we've been trying for a year and still no baby. 😭

This is my test after waiting the appropriate amount of time.