Placenta Prévia

I went to my doctor last week to child the babies spine and to find out the sex of the baby! We are having a GIRL!!!! However I was told by my doctor that I have low Placenta Prévia! I didn't know what that was until my doctor explained to me! I got very alarmed when he started talking about having a C Section if it doesn't move! Already having 3 easy natural births this scared me! I go for another ultrasound in 3 weeks! I pray this is gone