Yellowing causes headaches

Hi, At the final stages of the plant life, the plant starts to using the nutrients to create budz. So, yellow Bottom leaves Can be normal as nutrients are used. If the yellow increases at a drastically rate, then you might have nutrients deficiency or Plant is lock and wont absorb any nutrients. Make sure you stop nutrients a few weeks before harvest. This clearS out any excess nutrients. Happy harvest🌱🌱🌱🌱!!!!

Thats the fade baby!! The lower leaves stop using nitrogen this late into flower. You are doing it right! If the leaves were yellowing from the top down and coupled with twisting, brown, crispies, etc there would be a need to worry, but your plant looks great