Placenta Previa

So I found out it was a girl yesterday, which was super exciting since I have a little boy already, however my ultrasound tech told me soon afterwards that I have Complete Circumvallate Placenta Previa....I have to go back at 28 weeks and see if it's moved. I googled it last night which totally freaked me out bc it said this type hardly ever corrects itself! Has this happened to anyone else?! Any info would help!!