BFN at 12dpo; no period?

So I tested on 12dpo, got a BFN, (which was 2 days ago) and today AF was supposed to show up but she still hasn't. I have very regular cycles and it always starts in the morning but here I am, still no AF.

Is it possible I could be pregnant, even with a negative test just a couple days ago?

If so, when should I test again?