Chronic Hypertension and Acetyl Salicylic Acid in Pregnancy

This study is testing whether low-dose aspirin, taken during pregnancy, can reduce complications for women with chronic high blood pressure who are pregnant. High blood pressure in pregnancy increases the risk of preeclampsia (a dangerous condition) and other problems for both mother and baby. **You may be eligible if:** - You are pregnant, between 10 and 19 weeks and 6 days of pregnancy - You have chronic high blood pressure (either already being treated or newly diagnosed before randomization) - You are carrying a single baby (not twins or more) - You have signed informed consent **You may NOT be eligible if:** - You need blood thinners for another medical reason (e.g., blood clots, antiphospholipid syndrome, mechanical heart valves) - You are already taking aspirin for another condition - You have significant protein in your urine (a sign of kidney damage) - You have active bleeding or aspirin allergy - You are carrying multiple babies Talk to your doctor to see if this trial is right for you.