It's very common to have nodules with normal thyroid function. Many people have nodules and never know they're there.
It's important to note, though, that "something" is causing the inflammation and Hashimoto's is the most common cause. There are, however, other causes of thyroiditis.
Some people do have Hashimoto's and have negative antibody counts, though it's not real common. They can have Hashimoto's for many years before labs will show thyroid function out of range, even though symptoms can be present.