My first I had out and conceived within three months, but I'd read up before and took vitex, evening primrske oil and pre naturals, sonnev had an issue with my cycles when it came out.
This time, had my implant out almost 2 weeks ago, started with the vitex when I came out as well as royal jelly and pre Natals and had a period already.
My body has a tendency to go complete crazy and I think these things really help me, after my son I didn't take anything and I had huge problems! I bleed extremely heavy and for weeks at a time, sometimes months. I actually couldn't go out as a Tampx and pad would be soaked though in half an hour whenever I stood up. But for me these things work keep my hormones and cycles in sync.
I have heard people struggling to get pregnancy after the implant but that goes for any hormonal contraception, eventually they will work themselves out.
But if you want to try and jump start your cycles it may be worth reading up on vitex.