Heya!
Yes I would say that is alittle early for leaves to show deficencies during flower. Looks like she is being underfed and wants some more food. I noticed in your diary you don't list the pH of your water, for soil we want to make sure it is 6-7. If you know your source is within this range of have been phing it to this, then I would add more nutrients.
Now that you're a couple weeks into flower you should be feeding less nitrogen and predominantly more potassium and phosphorous. During the flower stage the plant will use a lot more potassium and phosphorous to go into bud production.
Now in saying this, are those few leaves getting much less light than the rest of the plant?
Good luck and cheers