Can someone explain? Need help!

Paytin

So my period is now 13 days late and I am NEVER late. I had a realllyyyy faint line on Monday morning with a dollar store cheapie. And what looks like same really faint line on a FRER today, but my mind might be playing tricks. So just curious, is it Normal to get a late bfp or should I be making a doctors appointment to see what up. Has anyone ever got their bfp after being 13 days late?