Depression?

I'm beginning to wonder if I'm depressed. I didn't even change out of pjs today and haven't left the house since Saturday morning. But then I wonder if depressed people wonder if they're depressed. I don't have an answer. All day I've been putting off things I need to "go out" to do, convincing myself that I didn't have to do them today. And really I didn't ... but they have to be done eventually. See - I'm just chasing my tail around in circles.