I had a scan today (36wks). the midwife i am under wanted to check babys growth as my last baby had her shoulders stuck. the theing i'm worried about is the head and leg measurements only measure 35wks but the abdominal measuremant is on the top centile, the midwife didn't seem too concerned and told me that it could just be baby needs to pee or poo is this right and is it something i should worry about?