trying to conceive

So my next Depo shot is due in a few weeks and I'm going to skip it because we want to have another baby (our son is now 18months old) I know that it might take some time for my period to return however I've never had troubles in the past when I've stopped contaception. Just wondering if there is something I can do to my body now prior to conceiving just to get it ready? I've read that folic acid is a good supplement to take.