Weeks 11 to 16Strong researchWith your doctor
Ask your doctor if you need low-dose aspirin
For women at high risk of high blood pressure in pregnancy.
Why It Matters (Clinical Guidance)
- In high-risk women it cut early pre-eclampsia by more than half.
- It needs to start by about week 16 to work.
- Never start it yourself. Your doctor decides.
Primary Citation: ASPRE trial (NEJM 2017); NICE; ACOG
Last checked: October 2026 • Medical review panel forming