Straight to the source!
For those who don’t know, Pinterest has a Source page that shows you the most recent pins made to a site. For example, the dPS source page is at http://pinterest.com/source/digital-photography-school.com/
To find yours, just substitute the dPS URL for your blog’s URL in the link above. If you don’t have much pinning action on your blog, you might not have one yet, but quite a few of the small blogs I tried it on did.