“Even though it’s ‘oh so trendy’ to carry water, during pregnancy it is quite wise,” says Mary Brucker, director of the Women’s Health Education Program at UT Southwestern Medical Center at Dallas.

Especially as the weather warms for spring and summer, dehydration may result in contractions and even preterm labor, she says. You can gauge your level of hydration by listening to your thirst and by watching your urine color, she says. Urine should be light yellow, not dark - although prenatal vitamins can make it brighter.