After I posted that I wasn't sure what to make of the ladybugs, I came inside to find the front door screen crawling with them - on the inside! No idea how they got there. There were probably close to a dozen. I shooed them off. The next time I came to the door, they were all back. And every time I chase them off (so they don't die trapped between the doors!) they come back.
It's like someone is trying to make sure I get the message.