This will vary depending on when during the month you moved in.
If you move in before the 19th of the month, Aurora should be able to receive your prorated rent.
If your move in date is after the 19th of the month you will most likely have to make the first payment.
You should always check your LES to ensure your rent has been paid. If you need to make a payment you can always do so by check, money order, credit or debit card.