So I'm supposed to be in my last week, everyt...

The soil may have been very nutrient rich. The yellowing and dying off tends to come as the plant exhausts the nutrients in the soil. I grow in coco coir and it still takes about a week of flushing coco before I start to see signs of deficiency in the leaves. It still is a somewhat of a controversial topic whether to flush or not. I always have and always will. When you feel the trichs and buds look ready, cut her down. A few extra days could end up with a ton more amber, but that's ok if that's how you like your smoke.