Twin 1 50th percentile and twin 2 70th - how accurate were your scans

Hi all

I’ve been having scans fortnightly from like 6 weeks and from when they started measuring twin 2 was always the smaller twin measuring about 30th percentile.

Today at 29 week twin 2 is measuring on 70th percentile and twin 1 is measuring on 50th.

How accurate were your scans as I am now worried that the newborn clothes aren’t going to fit twin 2

Thanks