7 weeks flowering, not sure if iv got a prob

iv got 3 plants at 7 weeks flowering and most all the fan leaves have turned yellow and fell off, and now alot of the other leaves are turned yellow. not sure if its normal or not cause it hasn't happened in any of my other grows, but i have heard of it with other people. one of them im not sure will make it another week and a half to 60 days. should i wait it out as long as possible untill all the leaves are gone?

i water every 5-6 days, (my soil retains water well, but is light and airy) they are under a 400 watt hps, and up untill now iv been watering with a 15-30-15 nute, with 1 tsp molasses per half gallon and didnt last time cause im going to start flushing

beautiful girls that u got there