Anatta during meditation
You don't have to look for anatta. That's completely misunderstanding what anatta means. Anatta is a characteristic. Meaning every experience is anatta.
Look at experience (any experience) arise. You don't make it arise. That happens according to conditions. That is what anatta means.
Feelings, memories, hearing, thinking .... everything arises according to conditions. Whether you like it or not. You can't stop experience from arising.
That is what anatta means.

Don't try to reach stages. Don't try to gain anything. Just observe objectively.