Either the pot is too big or your transplanting schedule needs a do-over. Unless you plan on growing a 6-footer your plant will delay vegging until the roots fill the pot. With a nice healthy bushy plant like that I would like to see the largest leaves just now reaching the pot rim. The roots will grow out at near the same rate the largest leaves do. So you can tell when the roots have filled out by watching the largest fans. IF you had used a smaller pot as described your plant would just now be starting its explosive inch+-a-day vegetative growth. Now it is officially still a seedling and you will see little aboveground growth for 2-3 weeks. Next time try going from the first small pot (solo cup?) to something around a one-gallon in-between pot. In between the first exposure to dirt and the final pot. HINT -- a general rule of thumb is that a plant needs one gallon of pot size for every month you plan on keeping the plant. My seedlings/clones veg for 4-5 weeks and flower around 6 weeks. So biggest pots I usually use run from 1 3/4 to 3 gallons. If you put a new seedling into a 5 gallon pot you can count on waiting extra weeks while that plant spend way too much time and energy building up a huge rootball your plant does not need. Good luck, BigSteve.
PS - now is the ideal time to FIM/top the plant for an even bushier grow.