When to Test Again?

Colleen

Period is now 15 days late, only DTD two days before it was slated to begin. I thought I saw a veryyyyyyy faint line on FR Sunday, then had two consecutive negatives on dollar tests.

I have one FR left, and assuming AF doesn't show I'll take it just to be certain, but when?

I just want to be certain that I'm not pregnant and my cycle is just broken 🙃