Mmmm, I probably wouldn't go implanon if TTC is on the cards - I had mine in a year and a half maybe a bit more and was taken out so we could TTC. While in it was very much like depo for me, no periods only a little bit of spotting here and there and no major side effects. My cycle came back about 6-8 weeks after it was taken out, but it took us about 6 months to fall pregnant after that.

After this bub I'm thinking of using depo again as we only want a reasonably small gap between kids and I am hopeless at remembering the pill! If you were using the depo shots successfully before, and had no problems conceiving your DS maybe give that a go for 6 months then swap to a barrier method to let everything settle back down before you TTC?