Agreed, when taking vitamins your body takes what it needs and flushes the rest out your system and vitamin B is good for brain development so I dont see anything wrong with that. I have taken my prenantals by mistake 2 times in one day, my baby is fine, I believe it just helps with development if anything.
Ya I wouldn't be worried. You stomach is probably upset bc you are worried not bc of the vitamins. As long as you aren't always doubling your dose you should be fine ;-)
B vitamins are water soluble. Your body uses what it needs and you **** the rest out.