Yellowing or any issues with only the older leaves normally indicates a problem with mobile nutrients . Mobile nutrients are nutrients that your plant will pull from other parts of it’s self towards the newest growth which is why your bottom leaves are affected and not your Top. If it was a non-mobile nute your plant would not pull it from the bottom to the top because it is unable to do so . Your NP and K are examples of mobile nutrients .
Your plants look fine to me but I’m just looking at a photo . Most comment reason for yellowing leaves imho . Leaves not getting good light , magnesium deficiency , nitrogen deficiency .
Better photos and more information on what kind of soil your using and what your feeding her if anything would help in determining the root of the problem .
In soil you shouldnt have to feed nutes before the first 3-4 weeks and your plants look young .
Im sry but with out better pics and/ or more information that’s the best answer I can give you .