Low dosage aspirin during pregnancy

Ashley
Hello, 
​I am 9 weeks pregnant and my Doc. Has prescribed me a low dosage (75mg) aspirin to take daily. I'm not sure how I feel about this because I know that aspirin can cause severe birth defects in the fetus. Doc. Wants me to take the aspirin to lower my risk of developing preeclampsia. Has anyone every had their Doc. Prescribe this to you? What did you do ?