Hey there kiewl, Pollen won't have affect the plants, not yet anyway so it's not that. Second, there's plenty of 4 week veg plants out there, especially when folks do 12/12 from seed. It took three days after the flip to show pre flowers so it may take a few more days even a couple weeks to get into flower earnestly . Nothing to worry about , it's probably just a healthy plant about to get huge ! Hope this helps.! 🚀