Aiyoo jangan risau sangat lah, a few of my mum friends dapat similar feedback during pregnancy and baby turned out fine! Biasanya baby head grows at slightly different rate je, doesn't mean anything is wrong, but definitely follow up dengan your doctor at the next scan to monitor, okay? They'll keep track and let you know if ada any real concern or not, so just trust the process and try to relax macam boleh la hehe.