those look sativa dominant..it may take 17 days or so just to signal the switch to that strain..relax and she will fill in ...you probably have 10 more weeks
Thats a sativa dominant if not a pure sativa
They can take longer to move into flower when using a 12/12 photoperiod. Now that they have finally started flowering though you should continue with 12/12
If you were to grow this strain again I would suggest trying 11/13 photoperiod when you want them to start flowering. after they have fully begun to flower then you can go to 12/12
Okay I haved been confused because I read where some say it starts from the light cycle change and not days but yes I been counting days since I change to 12/12
Def not a pure sativa this I know.