Get enough sunlight in your first trimester.
Low levels of vitamin D may put women at risk for preeclampsia, a dangerous pregnancy complication. Researchers found that women with preeclampsia were more likely to have had low blood levels of the vitamin in early pregnancy. Vitamin D is found in fortified milk and cereals; certain types of fish, such as tuna, sardines and salmon; and supplements. It is also made by the body when exposed to sunlight.