Baby messuring a week ahead

Elisa • Back using my favourite pregnancy app, baby number 6 on its way 🤰🏼💁🏽‍♂️🤴🏻👸🏼🤴🏻👸🏼
So i just been for my 28 week appointment im currently 28+4 and my midwife messured my bump and said im 29+5 does this mean im a week ahead or my baby is going to be a big baby im confussed 😵