suddenly I am getting yellow spots

I've had a couple spots here and there during veg but no big deal as the overal health of my plant looked fine, but the past three days I have seen increasingly more of them. Pretty much right after I decided to flush it with a bunch of water but it was also occuring befor just not as much.

I dont see any spider mited and no other bugs. Every once in a while...maybe once a day, Ill find a gnat flying around in my house but thats it. I've got probably 6 or 7 weeks before I cut her down......WHAT TO DO!

Hard to tell without a picture. Sounds like it could be a ph problem. Are you ph'ing your water? Giving them any nutes? What type of lights are you using? Do you have good ventilation? Are you growing in soil or hydro?

I'm growing in soil(Scotts), and water every 3-4 days(I dont have a PH tester....I know thats BAD) I am feeding her with super thrive and MG(flowering) and she is under CFL's and 9600 lumens in the 2700K flavor.

https://www.rollitup.org/view.php?pg=faq&cmd=article&id=37 pictures of lots of common plant problems, see if you can identify it with that or one of the other posts in the FAQ (top of the screen)