You may have noticed a banner in the top left corner of your Tribe's Pins. These are just a quick way to see the Pins that you've published or scheduled to your boards.
Here is a Pin that I have published to my boards from my Tribe. It has a green Published banner to let me easily see that I've already published this Pin to one of my boards.
Here's a Pin that I have currently scheduled to my board, but it hasn't published yet. It has a blue Scheduled banner to let me know that I have this Pin scheduled to one of my boards now.
You can use the Tabs at the top of your Tribe's page to quickly see your Pins and the Pins that you've published and scheduled from a Tribe. Read more about Tribes Tabs in our Knowledge Base article: Understanding the Tribes (All, New, Yours, Shared, Skipped) Tabs.