In the first week you have an explosive grow , in the second week the top of the buds start to show some pistils, in the 3rd week is like you pics, now the plant start to fill the space between the internodes ( 4th week) and gain some size until the week 6, where u usually start flushing with regular seeds, and here the bud start to fill the entire bud with flowers covered with thricomes.
I hope I have clarified your doubt, sorry for my english i’m a little bit high ✌️🏽