are you giving the plant 12 hours of dark and 12 hours of light?..
you can put it out side for 12 and inside in the dark for 12 it might turn out to be a male.. geez 5 ft ya looking at 8 foot maybe if its still stretching.

ya buds will get bigger over the next 7/8 weeks use the MG at half the recomended dose for now..