Hi & Welcome to BB!

I am currently pregnant after having my implanon removed, so here's my experience...

I had the implant(s) for 5yrs and I was one of those people who had no periods during that time, so perhaps the hormones may have been a bit strong for my body.
I had my first AF 31days after having it removed and my cycles were eratic after that. 31, 49, 21, 24, 37ish etc. I think I only ovulated once prior to the successful cycle. It took us nearly 6months to concieve.

Unfortunately for us it did take some time, but Im certain that my temping combined with checking my CM helped me identfy when I was ovulating! It was soo important to know when I was ovulating so we could catch that eggie

That said, I believe you can get pg straight away (that is, in the first cycle) my guess is that it would just depend on how the hormones from the implanon affected your body.
So my only advice is do what ever you can to identify when you are Oing and go for it!!
Good luck!!