Suddenly depressed at 39 + 1. Anyone experience this but not have post partum depression?

I'm so worried I'll have ppd since I've very suddenly gotten depressed just in the past couple of days. I think it's because I had showers and fun stuff I wanted to get through and I did everything. But now I'm done with all that fun stuff and ready for baby and I still have to wait. And I know I'll go overdue because I did with my first two. And I don't want to give birth to another 9 lb+ baby and be torn to pieces. And I'm worried about leaving my big boys. I'm just...ugh, all over the place emotionally.

Anyone else go through this before delivery without developing ppd?