hmmmm.. u know what? i wouldn't worry about it, if the lower leaves aren't getting quite enough light (this happens often for me in the seedling phase) then they will usually just have brown spots, turn yellow and fall off. Once they get bigger you'll notice that at the bottom of the plant, the leaves that aren't getting any light will just drop off since they are a waste of energy to have around for the plant. If they don't turn yellow in about a week and drop off I'd worry, and also if the new upper leaves get it, then it's either bugs or pH. So to summarize, if just the lower leaves get it and fall off, ur fine, but if the whole plant gets it, transplant and look for buggies! don't rely on aquarium strips, go get urself a soil analyzing kit (they're pretty cheap) and as for the leaflets, they don't immediately go from 3-5-7 on each node, they just get more as the plant gets older and it also depends on the genetics, sativas can get 11+ leaflets and ruderalis generally stay with 3 leaflets