I need healp/advice!

Va
So I had a scan 4 weeks ago and a doctor said the baby looks very healthy, but big baby and big head... So he asked me come back after 2 weeks to see maybe baby has diabetes or he's just a big baby with a big head, then I came back after 2 weeks for another scan and he said now he's normal size baby, but his head still growing, he said probably they did bad measurements on the last scan or baby stopped growing, so asked me to come back on Monday again for another scan to see what's exactly going on... But he believes that baby is ok. Is this ever happened to any of you??