I was going to say what Lily Dust said - see your GP for b/w to test your immunity for things like Rubella at least 3 months before TTC (because you have to wait 3 months after the vaccine) and mine did a heap of others too. I was also told it was best to take folic acid for 3 months prior to conception (in the end, I was on them for almost 4 years by the time DD was conceived, but that's a different story). I started off taking Elevit but switched to the Blackmores Gold when I was pg with DD. I did need to take an additional iron supplement with them when I was pg with DD, but not while TTC (recently had the full set of b/w run and my iron levels are fine).