Placenta Previa

Gris
Anyone in Here diagnosed with Placenta Previa? Or have had a previous Placenta Previa? Just got back from my doctors appointment and he told me that there's a chance I might have placenta Previa but would assure nothing til week 27 I just turned 20 weeks and had my ultrasound at week 19 he said results from ultrasound are still too early to determine.