There is a pitfall with such a segment. When you add a Visit container after the Entry page, you set the criteria the way that the Order event should happen in a subsequent Visit. In other words, you exclude those who could place an order in the Visit of landing to the blog pages.
I would just add "Orders >= 1" without a container to get those who placed an order after landing to the blog.
Does it make sense?
P.S.: make sure that the data range applied to the panel includes more than 12 weeks.