Hi, This is my first grow. I’m growing indoors, I’m 15 weeks into my grow, about 8 weeks in flower. This is a sativa strain. I started my final flushing about a week ago. I’ve not had any insect or disease problems to this point. Now I’ve found a couple of the sugar leaves that have brown spots starting on them. The plant and bud looks good in general. Is this just stress from lack of nutrients because I'm flushing, or am I about to lose the plant?