Some shedding is normal at the end of the flower cycle. Though, throughout the years, it seems to me like the healthier the plant, the less shedding I get. Now I don't know if this is true or not, it's just an observation I've made throughout all the flowering cycles I've done. At this point, with you being so near the end of flower, I wouldn't worry too much about it. You've made it far enough that regardless of what happens, your harvest should be safe. TWW