Hi, Itsa 35 Week grow until now, right=?and there are alot of possibilities why leaves turn yellow. but i would go with the // to me most logical Point,,, Girls are coming to the end...and kind of discoloring is the sign . <I wont be worried about yellow leaves in this stage. Because you are so close to the End. Just go on like you already do...
Just concentrate to the Flowers ( like the plant does)