My dr never told me I had neoplasm of uncertain behavior of the ovaries. Should I be concerned?

Very unrevealing. This actually sounds like the description of a billing code rather than a true diagnosis. It could be used to describe literally anything involving the ovary. If there was no discussion at all with your doctor regarding your ovaries, it would be reasonable to ask what this refers to.
Neoplasm. i would make sure you continue to follow up with your doctor and get the proper testing done that your doctor desires. Don't put this off.