Hello I had my 20 week scan last week and they want me back to check the vessels on my placenta and babies footprints as he weren't still enough🙈 on my report it says "retro placental vessels noted above anterior placenta. The placenta is clear of the internal os. This will be checked at 22 weeks" does anyone know what this means? phoned my midwife but she hasn't answered today! Just worried it's something I should be cautious of/about!