So, let's look at some history and set realistic expectations. First the history: people have received appointments up to a few days prior to I-day. So, all hope is not lost. "So, you're saying there's a chance!" Second, let's set realistic expectations. Most appointments have been/are being sent (April is the big month, historically, iirc). If you haven't heard anything by the next couple weeks, your odds of getting an appointment are low. Don't abandon all hope, but start seriously deciding on which back-up plan to select.