No problem .I usally start out with a 3 gallon pot from seed and just let her stay in there till harvest(My plant was roughly 4 foot tall by harvest in a 3 gallon pot)
Also your soil do you still have the bag that it came in.If so look all over the bag to see if it has ferts.And if so Garden Knowm said that the trick to Miracle Grow Soil is to water with a PH of 8.0