You won’t know if it’s a male or female until you start seeing white hairs or little club shaped pods, where the branch meets the stem. If it’s a photo plant it probably won’t show signs until the end of the month/sept when there is 12 hours of darkness, if it’s an auto, likely in the next 2 weeks you may be able to determine. It looks very healthy and a 4 litre pot is more than enough, but don’t expect a super crop of all goes well, you could maybe see between 1oz and 2. Take a peak at my sativa grow, they are in really small pots.
Good luck.
Cheers.