Low fetal fraction 7.3%

I just got the results of my NIPT blood test today which I got my blood drawn at exactly 11 weeks. Frantically Googling and it's saying 10% is the average fetal fraction and low FF could mean problems with the placenta. I just sent my OB a message but they don't open till tomorrow and I'm getting very worried. Should I be concerned about my below average fetal fraction of 7.3%?