My OB/GYN told me it's good to start taking them before pregnancy, during and even afterwards. I know a lot of women who still take them long after they've delivered their last baby. Plus vitamins are good for you anyway, unless you've been told otherwise. Hope this helped.
'The fates have given mankind a patient soul.' -Homer
I started taking them after I found out I was pregnant. Now my DS is 13 months old and completly weaned and I am still taking them because I like the way they make me feel. I seem to feel more tired if I dont take them.