If they are past week 5, the coloring could be fading. Plants naturally suck out all of their stored nutrients while in the final weeks of flower, so the yellowing of leaves doesn't necessarily mean something bad.
I don't see any dots on the leaves, but I do see some slight nutrient burn based off of the tips of leaves. Just water the plants with pH'ed water for the weekend and it will be fine.
I hope this helps.