160mg aspirin??

Hi mamas! My doctor prescribed me 160mg of aspirin because of High BMI, to prevent preeclampsia in pregnancy. I'm currently 12 weeks. But i'm afraid 160mg is a high dose of aspirin. I read the side effects of aspirin in the leaflet and I'm so scared. I don't know what to do.. is it risky to take 160mg of aspirin in prsgnancy?