As a taxpayer, you are responsible for ensuring that your tax return has been filed successfully. You MUST ensure that your return has been accepted by the IRS or state agency. See Checking Your E-file Status for more information, or get your current status.
If you expect to get a refund, you can see your IRS refund status at Where's My Refund. For the status of your state refund, see States - Where's My Refund and select your state from the list.