Am I using my credit cards correctly?

I'm trying to build credit. I have one secured credit card, and one unsecured. I rarely carry balances on them. I might use them to buy something, but then go online and make a payment on it 3 days later. I wanted to know if I should be waiting to make these payments until the end of the statement periods or if it's okay to do what I'm doing? I'm rarely carrying a balance for longer than 4-5 days, so I'm not sure if the card is even reporting to the credit agencies anything about my revolving credit/debt. Thanks for any help in advance.