Preeclampsia is a pregnancy complication characterized by high blood pressure and signs of organ dysfunction, usually occurring after 20 weeks of pregnancy. It can lead to serious health problems for both the pregnant person and the baby. Although some risk factors for preeclampsia are known, effective strategies to prevent the condition remain limited.

The purpose of this research study is to determine whether vaginal progesterone can help prevent preeclampsia in pregnant individuals. Progesterone is a hormone that is naturally produced during pregnancy and is already used for certain pregnancy-related conditions.

Participants who choose to join the study will be randomly assigned (by chance, like flipping a coin) to receive either vaginal progesterone or no medication. Participants will use the study medication as directed during pregnancy and will continue to receive their routine prenatal care.

Researchers will collect information from prenatal visits, medical records, and delivery outcomes to determine whether progesterone reduces the risk of developing preeclampsia and improves pregnancy outcomes. The information gained from this study may help identify a safe and effective way to prevent preeclampsia and improve the health of pregnant individuals and their babies in future pregnancies.