ugh this app!..I wrote a whole thing to help you and it was deleted when I press send... anyways cal-mag is most likely culprit. since you are still in first week of flowering try foliar feeding, when done proper you will notice an immediate "greening". in past my plants looked like this when I have overwatered and plants sat saturated too long. Also in the past my plants have looked like this when I used water straight from tap. I live in city and water is "treated" with chlorine so I must dechlorinate before giving to plants or plants suffer badly. hopefully when your cal-mag arrives you can begin to bring back to healthier status with ease :)
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