With DS 4 I was taking:
Prenatal vitamin
DHA
Calcium (IG levels)
Magnesium (IG levels)
100 mg B6
Vit. D (IG levels)
4000 mcg folic (I had to take this much folic because my DS 3 has a mild form of spina bifida)
Vitex
With my DD, I wasn't taking ANYTHING. I had totally given up that month, it was seriously the last month I was going to try due to my age, and I felt like I had NO chance at pg. I ran out of prenatals and DHA about 6 weeks before I got pg and didn't have $$ to replace them, and then I read some stuff that folic acid could cause cancer and I quit taking it about a month before I got pg. My attitude was kind of, eh, F-it, I won't get pg anyway. If I had known I was going to get pg after all I would NEVER have stopped the folic acid for sure and would have found a way to get more prenatals and DHA. Baby looks normal so hopefully I dodged a bullet there (but DS 3 spina bifida was not visible on ultrasound either.)
I had been taking Vitex for 5 or 6 months before that month but I stopped it the month before I got pg.