I came off the injection 18 months ago with intentions of conceiving in the near future, fully aware that it can take up to 12 months for period and body to go back to normal etc.
After 6 months my periods restarted and at the time we just decided to have the attitude that if it happened it happened, was in no big rush but would have been happy if i fell pregnant, but I didn't.
After a chat with my DP a few weeks back we have decided that we would like to actively try to conceive now.
Just after some tips really, other than obviously having sex 
I have been taking pregnancy supplements now for the last couple of weeks after being told by a relative it was best to do so whilst trying to conceive and not just after finding out I am pregnant.