Measuring ahead by a lot?

I’m 28 weeks but my midwife measured my uterus and my fundal height was 35. As far as I’m aware the number of cm tend to go hand in hand with how many weeks you are?

She told me to not worry about it as it can be combo of water, baby, me etc but compared to some women on here I feel like that’s a big difference?

Anyone else been in this position?