Welcome. Going directly to your question on size, that is considered a small tumor from what I understand. Yes, chances this also early. I say this with the understanding none of us are doctors.
You are also getting the normal protocol. Ct scan, TURB and i presume you have had a cystoscopy, although the TURB should accomplish the same looking into the bladder. You really won't know much more until the pathology is done. It could be several things besides a tumor so you simpy will have to wait. And, we know that is no fun.
Keep asking away, someone should be able to ask further questions.