During antenatal each study visit (i.e., at 24, 32, and 36 weeks gestation), participants will receive the routinely recommended screening and treatment. This will consist of weight, blood pressure, and urine screening, as well as measurements of fetal growth (fundal height) and fetal well being (fetal heart rate) at each visit. A limited fetal ultrasound will be performed prior to 20 weeks gestation to determine gestational age, and a cervical length evaluation will be performed at 20-22 weeks gestation. At the 24-week visit, participants will also be screened for depression using the Edinburgh Depression Scale.