Vitamins to help conceive

I don't believe I'm infertile I have a daughter who happened by accident but I was taking some vitamins before I did come out pregnant. It was three bottles you take all together but I don't remember what they were. I really want another child and I've tried black cohosh but is there anything I can take in conjunction with those? Black cohosh also says not to take to take for so long. I just don't feel I'm old enough to try infertility drugs I'm only 26. Any ideas?