Hard to say. I'd expect calcium/magnesium deficiencies to show up as spots. Assuming you're following the bloom-phase nutrient levels prescribed for the products you're using, I'd just trim it and keep going. But if you're making your own nutrient mix, it looks like you're far enough into flowering that you wouldn't need much nitrogen (turning yellow by flowering week 6 or 7 doesn't freak me out anymore, lol). Also, the leaves look wet. Personally, I only mist plants during veg. You might disturb the leaves if you spray bloom nutrients directly on the leaves. You'd be surprised how little water you need during flowering. You'll want to taper it off even more toward the end.