How soon is too soon to test?

Nikki

AF is due on the 29th. I started getting slight cramping, sore breasts, and saw what I think may be implantation bleeding yesterday. We're trying for baby #1 so I'm just really excited and I'm really hoping I'm pregnant, but don't know how soon is too soon to test. Any recommendations? Also any recommendations on what test to use to be most accurate with testing early?