Polymorphism? Does anyone have it in this group?

Rebekah • Baby noble due in March 🍀💕

At the very beginning of this pregnancy they found out through blood testing (bc I had previous miscarriages before) that I have something called polymorphism. They gave me a paper on it and explained it to me but I have since forgotten just exactly what it was, I take a baby aspirin a day and have had a healthy pregnancy thus far being 18 weeks and 3 days. But just curious if anyone else had this problem or if anyone can explain it better to me?