How long after you conceive will implantation happen?

Caila
My period was all off last month so I have no idea when I'm supposed to get it or when I'm ovulating, which honestly has taken the pressure off of it all! It's been a fun month. 
With that being said, I expect AF soon (but hopefully not), but am wondering how soon after you conceive would implantation bleeding occur and what's the difference between that and AF?? We have been trying for 7 months!