TMI. Confusing AF this cycle.

Kim
I have been tracking on 2 apps. One said that AF should be July 2nd. The other said June 28th. Well I started spotting on the evening of the 27th. It has not gotten any heavier (I have not had to use a tampon). I am however still spotting. Could this be implantation bleeding? I am really hoping that it is. My husband and I have been trying for over 3 years.