Hi Melissa, I have a similar story and I suppose many people in the USA do too.

Here are a couple of my essays related to the topic. In the second one I note that any ancestor six or generations back might not show up at all on the test. So if your Indigenous ancestor is far enough back, the test might not show it.

https://medium.com/@gaertner-andy122/relatively-obsessed-why-i-need-to-focus-on-my-european-ancestry-first-984ffccd15c0

https://medium.com/@gaertner-andy122/relatively-obsessed-why-i-shouldnt-ignore-family-stories-about-native-ancestors-4a68a065997f