Marginal Placenta Previa

Any moms here have any experiences with Marginal Placenta Previa (placenta close to but not covering cervix)??? At my 20wks scan my placenta was close to my cervics and I'll be going back got a follow up ultrasound around 28wks to see if it moved.. If any of you have any experience with this type of thing did yours move out the way, stay the same, or move to cover your cervix?