I guess it may depend on what health problems you had and if its resolved... But on the whole if you are well now and eat a well balanced diet there should be no problem TTC now! On a side note if you were taking elevit or another 'powder tablet' it may be worth looking into trying another brand as they've been known not to properly absorb in many women (i use blackmores they're a liquid capsule).
I hope it all goes well for you and you're welcoming a new LO before the end of the coming year