If your blog seems to be staying in the "Blog Building" stage of publishing for a longer period than normal, please wait ~10-20 minutes if your blog post has over 150 images.
It is likely that you are trying to publish your blog post at the same time as a few others, therefore the increased traffic may have slowed the publishing service.
If you blog has not published after an hour of uploading, please contact support via the chat bubble in the bottom right corner.