Growth scan 28 weeks showing possible problem

Hello We had our first growth scan yesterday these are due to my first being small, they measured baby and said he is a great size just on the 90th centile however they have said that there is high pressure in the cord? They explained that if baby was small they would be more concerned but because he is big they are not sure what is happening. I have to be re-scaned next week to double check in case he was sitting funny and then continue with growth scans. I just wondered if anyone had this at all as all I can find is information on small babies with this? Thank you