Aspirin and Preeclampsia

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If you've had preeclampsia and took aspirin how long did it work for? I've been talking it since 17 weeks and don't go back to seeing my obstetrician until next week.

I feel like something is wrong but when I check my blood pressure it's low not high.

I've had preeclampsia and hydronephrosis in my last two pregnancies and this is how I felt both times.

Thank you