I took Solgar Prenatal vitamins (I get them from Amazon as they're an American brand) from about 6 months before last time and will do it again from about 3 months before, give or take (as we aren't 100% sure of when we'll be able to TTC again, so I don't want to waste being on them forever if I need to push it back). I really liked them. They have a gentle form of iron, which is great if you don't normally tolerate iron. I started on Pregnacare originally and they gave me such bad stomach pains that I ended up having an endoscopy because they thought I had an ulcer. We finally realised that the pain started about 5 days after I started on Pregnacare, so I stopped them and it went away completely. I would avoid those if you're sensitive to iron (I didn't think I was?) and if you can afford a bit more for something higher quality. If you do have any trouble, don't hesitate to try something else until you find what works for you.