Biobank on Prematurity, Preeclampsia and Other Pregnancy Complications

This study is collecting biological samples (such as blood and tissue) from pregnant women who experience complications like premature birth, preeclampsia (dangerously high blood pressure in pregnancy), or other serious pregnancy problems, to help researchers understand what causes these conditions. **You may be eligible if...** - You are a pregnant woman experiencing or at risk for complications such as premature labor, preeclampsia, or other serious pregnancy issues - You are 18 years or older - Your baby has a heartbeat at the time of enrollment - Specific eligibility depends on the sub-study you are being enrolled in **You may NOT be eligible if...** - You are under 18 years old - Your baby no longer has a heartbeat at the time of enrollment - You are not able to give informed consent Talk to your doctor to see if this trial is right for you.