It is normal for some leaves to turn yellow at this point of growing, though i cannot determine how many leaves have turned yellow with those pictures.
noticing, some leaves started to yellow from the edges, some from the middle, but most importantly that the majority of dying leaves are at the bottom of the plant.
at this stage id say that flushing would be the best solution, just get rid of all the nitrogen in soil and re-adjust all your nutrients, keep in mind that nitrogen is barely needed in flowering in the first place, so its easy to get the plant ill by Nitrogen toxicity at this stage.
Also i do think that the plant abit strechy, isnt she? You can still apply some LST training though at this stage if you want, that helped me previously even in flowering, but i dont recomment prunning some leaves now as long as your problem still persists, leaves are your plant's first line of defence.
also check the bottom of the leaves for any kind of infection/pests.
update man ♡