Late Period - When To Call Your Doctor?

Li

My period is now 6 days late. On days 1-3 late I got what I thought were vvvfl on all 3 tests that I took, which I’m now assuming were all indents. Lines never got dark enough to be noticeable and I have yet to get my period. At what point should I call my doctor to see if I should get Provera to kickstart AF? One week late? 2 weeks late? Not at all? I have no signs that AF is coming any time soon.