If it's a photoperiod, it should be done by the end of October (if you live in the northern hemisphere).
Autoflowers are unpredictable, which is why I'm not a fan. It could start flowering at any time. White widow auto, from what I just read, should take about 3 months outside from seed to finish. Now, since you're in week 7, I would say it's a little early to tell. It could just be a little slow and start to bud this week. Only time will tell.
I hope this helps.