Fundal height consistently off the chart

[Sela8097]

I’m 36 weeks pregnant..my fundal height has been consistently above the top centile line..today I measured 39cm! I was a healthy weight pre-pregnancy and haven’t gained too much weight but my bump is huge! With my first baby I was on 95th centile line and she was only 7lbs 15oz. My midwife doesn’t seem at all concerned but I thought such a big difference would trigger a growth scan?

It's changes in percentile lines that trigger growth scans rather than consistently high/low measurements.