Getting pretty anxious

15 dpo, AF is 3 days late. I had mild cramping about 5 days ago. No implantation bleeding..cm is thin and white/clear. Took a line test when I woke up..BFN.

What's up? What do I do? I mean..there wasn't even a trace of a line on that stupid test. 😕🙁 How long should I wait before I test again?

Does this sound like I could be pregnant??! AF is usually very regular. 😬