32 week growth scan

Reyna

I recently had a growth scan done and I was told baby’s abdomen is measuring small what exactly does that mean ? The doctor told me there is a good 10% and a bad 10% my baby is right in the middle he also said he is measuring 10 days ahead it’s all so concerning because my little dude might have a heart problem as well has any other mama been told her baby’s abdomen is measuring small ???