What to expect from bank account autopay

My account is set up for automatic payment from my bank account. The first month, nothing happened automatically -- so I paid the bill manually just in time. Now it's the second month, the biilling info shows auto pay is still set up, but a payment is not shown as scheduled nor pending and the payment is due in a few days. How can I determine if my payment will automatically occur on time? Autopay doesn't seem to be wprking even though it's set up.