14w pregnant. vit only has 400 iu vit d3 i don't get too much from diet or sun. do i need more? what's the impact to baby of too low?

YES!!! Many impacts!: Good question. Adults need 5-8000 iu of vit d to achieve optimal levels in fall ; winter (year-round if you don't get mid-day sun). Low vit d in pregnancy is associated with increased risk of gestational diabetes, preeclampsia ; babies with low birth-weight. See http://www.Medpagetoday.Com/obgyn/pregnancy/38113 it is safe ; wise to take an additional 5000 iu of vit d3.