Re-vegging 3 weeks in to flower plant leafs turrning yellow is this normal?

hey i am currently re-veggin 3 weeks into flower after learning sex and i know that you should expect the knew growth to be distorted but my leafs are turning yellow lke i have a nitrogen deficiency and my tips are burnt can this be due to the stress of re-vegging or is it more likley a deficancy.....to re veg i gave them a week of fresh water then started with a low dose of veg nutes