The spots look like something has been nibbling on the little lady. Apparently, fungus gnats and thrips. I would set up a few yellow sticky traps and join Chow_13. Spray with a neem oil emulsion every now and then until flowering, and the problem should stay manageable. If you notice a strong infestation of fungus gnats, get some nematodes. They eat the larvae in the substrate ✌️ Personally, I use nematodes preventively with every grow 😁