Pregnancy in early 20s... Miscarriage rates?

If I counted right I'm 3w3d right now (10 DPO) and just got my first BFP. I'm 20 years old, take folic acid every day, don't smoke, don't drink, limit my caffeine, I'm so nervous! I also have a mild form of PCOS (normal BMI, no facial hair, long menstrual cycles). No one in my family has ever had a miscarriage before. I'm pretty safe.... right?