I have noticed that small roots are coming out of the bottom. This happened last week also when it was in a smaller pot and I transplanted it. I don't want to keep doing this in case it hurts the plant. Do I need to transplant or what?
This is not enough information to formulate a respectable answer.
Pictures or gallon description please.
Generally try not to transplant more than twice, once after clone then maybe towards the end of veg before flower. Depends on how big and long you grow for the pot size.
Also above poster's are correct a few is not bad, you got a grower girl on your hands; congratulations.
This does mean something though.
1) She has the energy to grow fast.
2) She is searching out more nutes and water
This in mind you might want to plan for bigger pot's and feeding on this strain in the future.
Edit: Oh and yes sound's like you have a normal pot. You need something with side aeration holes. Then the roots won't just crawl downwards.