Hello mate
Few things - I started with one of those tools for reading ph and they are next to useless. Wasn't confident it was accurate so got some ph test liquid and found it measured ph8 water as ph7 - so it was way off.
You say the plant hasn't started flowering yet, but it appears that you are growing outside, so it wont start flowering until the days start to draw in towards autumn (or fall if you're American, doesn't say in your sig). If you're growing indoors, and have been on 12:12 for longer than 3 weeks then id say there may be something wrong with the genetics of your plant. Where did the seeds come from?
Also looks like you're overwatering (as is evidenced by the drooping leaves). How often do you water? Does the pot have good drainage?
Apart from that you're doing well. The plant is big and healthy looking apart from the slightly droopy leaves (which is no biggie). If its a female you should be looking at a pretty large crop from her when she does flower.