Implantation and testing 9dpo

So I don’t know how this works.. but I got to wondering if anyone knew.

So I had my youngest son 09/2019. We did IUI, while monitoring my ovulation. I tested in the AM on 9dpo and it was positive. So implantation was roughly 6/7dpo, right?

I guess what I’m asking is, would implantation occur on roughly the same timeline every pregnancy? Like your period and ovulation are (kinda) at the same time each month? I tried googling but.. let’s be honest. It’s google.