Plant starting to yellow too fast

Firstly. Idk where you are getting they have 2 weeks left? They aren't even flowering 2wks. Flowering period isis 45-55 days or around that range for auto at min they need at least 35 days of flowering. And yeah, it's not showing late signs you are only in early stages of flowering and what you are using Westland I've used, it's only good enough for 5-6wks of grow and that's now showing in your plant. And the fact that it's missing PK it's showing that now in spades. You need a bloom nute and with autos and their ruderails you'll also need a micro nute. Good luck pal