How common is placenta previa?

Bree 🖤♉️ • Mrs. W 5.5.16 💍 Boy Mom 11.6.17 💙 Girl Momma 8.5.19 💗 Girl Momma 9.22.21 💜 Dog Mom 🐶
I was diagnosed with this today and my doctor said she is not worried and that my placenta should move up further along in pregnancy seeing as I am only 20 weeks along today.. I am curious as to how common this diagnosis is. 

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