Help! Chorionic bump? 8 weeks + 3 days

Adri

Hi everyone! Need an advise. This is a pic of my baby 8w+3d. Everything is fine. 164 bpm. BUT obgyn is worried about the brilliant mass next to baby. Also said that sac that has baby is huge! 6cm. Any guesses?? Or someone with something similar? Could it be a chorionic bump?