15DPO no AF still BFN

Kt
So I am 15DPO and AF was dew 16/17. AF still a no show. I think I implanted some ware around 9/10DPO I had light pink in my cm. i took a test to day BFN. I have been a little crampy. I am so confused, I hope AF dose not show. And it's just to early to test. 
Last period 12/22. Ovulated 1/2