lowlife ak47 auto not autoflowering day 25

i have 5 fem auto ak47 from lowlife they are 25days old 2day and none have shown sex there under a 400watt hps and a 20/4 light cycle most autos i see on here start to show sex at 16-20 days or is this normal this is my first time dealing with autos and im just abit warey​