not sure what is going on

ok i have had these 2 plants for about 3 weeks, they are getting really close to harvest because i had gotten them from a med grower , he had too many plants budding, so he gave them to me.they plants were very healthy for the past 2 weeks, now im not sure whats going on,
the lower leaves died off, and on the bigger plant some of the bigger leaves are starting to wilt and die, and there are quite a few yellow leaves, what is wierd is most os the areas where the palnt is budding is pretty healthy looking, i will get pictures up later but they are sleeping right now, any opinions/feedback /questions i would love to hear

during the flowering stage the main fan leaves with yellow and die off as nutes are pulled from other parts of the plant for producing buds... from what you said it sounds like its normal... your plant is fine