Aspirin is known as an NSAID (a non-steroidal anti-inflammatory drug). Low strengths or doses of aspirin are often used to reduce blood clotting in people who have heart disease. For pregnant people who are at risk of pre-eclampsia, or at risk of having a low birth weight baby, taking low dose aspirin once a day during pregnancy can help increase blood flow in your placenta (afterbirth). Your placenta provides your baby with oxygen and nutrients during your pregnancy to help them grow. Read more below about when aspirin is given during pregnancy.
Note: Calcium has also been found to be helpful for pregnant people who are at risk of developing preeclampsia. Your obstetrician will also prescribe calcium if they believe it's needed. Read more about calcium supplements in pregnancy.