After a very long cold winter in northeastern Illinois, we had a few warm days. I was so surprised to see this very large bug on the side window of our car. I think it's a shield bug, but do you know the species? In the past, I've only seen a few smaller, darker brown shield bugs around here. So I'm very curious about this individual and would really like to know the species. Also, what could the cream-colored dot be?

(I looked through some images & thought maybe it could be a "spined soldier"?)