Hiya, I wouldn't worry, babies do the weidest things while they are baking! So much can change from 24 weeks too, your half way thru' so plenty of time to balance out.
My story?........My son was always measuring 5 weeks + from the 1st time they measured my tummy he ended up comming 6 weeks early weighing a good 6lb9oz....I suppose if he'd have arrived on time he would have been a 9lber!
When I was pregnant with my daughter the same thing happened & I was told she would come early like My son....She ended up 6 days late after 4 sweeps and weighed a whoping 10lb9oz, a whole 4lb bigger than my son! The midwives are brilliant at their job, but nobody can predict what your baby will do!
You will be fine, good luck & keep us posted x