M.M.
I had the same problem with my first pregnancy then I learned that most over the counter adult and childrens vitamins have poor absorption rates. I now take Melaleuca's vitamins, they are one of the few with an over 85% documented solubility so you actually have energy and feel better. You can learn more at www.oligofructosecomplex.net and www.livetotalwellness.com/TEXAS.
Good luck to you,