I usually transplant from 3 gallon to a 5 gallon pot, on the day of switching to 12/12. (when I also give her the last dose of veg ferts)
Sometimes I get lazy and don't get to it till the next week, tho. Late transplanting slows growth for a week or two, but if there are no other stresses, should be fine.

Would stay away from pre-ferted soil mixes for this task, tho. Mixes like Miracle Grow or SuperSoil have too much time-released nutes that could cause problems.