i would say that it is a female in the first few weeks of flowering, your lucky, most bagseed isn't as early flowering as your plant is, you should look to harvest early september. though at this point i would stop using fish(protien=nitrogen) as a fert and look for something at a store that is high in phosphorus, or the middle number in the n-p-k format, something like 1-14-3 and start giving it that every other week. looks good though! happy harvest hopefully!