I was on blackmores from the minute I found out I was pregnant (about 3 1/2 weeks) to about 20 weeks.
I got mad at them. On the bottle it talks about taking the vitamins and having a healthy baby. My bub was anything but healthy.
So, I stopped taking them.

I dont think they do any harm by taking them.
And healthy eating is good, but there are stuff in vitamins that you may not be able to get through food.