Baby jumping percentile

[MrsL2019]

Im 33 weeks and ive had 3 growth scans in total, the first 2 scans baby measured on the 23rd percentile. On my scan on Monday hes measuring on the 57th, i had the glucose test yesterday. If this comes back clear what other reasons could have caused a big jump like that

Measurements could be off. My second was on the 50th, one growth scan then said the 90th and the next was back to the 50th. No GD, baby 8lb 3oz.