How can you tell if you're about to be stood up/does this seem like I'm about to be?

made plans with a girl(whose admittedly out of my league) for 3-4 a few days ago. txted her at 10 to figure out exactly when(train schedules and such). tried FB Chat a few times and also no response. I'd call but then I'd feel like I'm being needy. so its now 330ish. **** it and move on with the day?