I hope you have heard the outcome by now. If not, please try not to worry until you hear back for sure. Many, many, time suspiscuous moles are removed and they are not melanoma.
Good on you for getting yourself checked out though.
Two months ago, I had a moderate dysplastic nevus removed. I went in to have my moles check, specifically for two that were darker and slightly larger than the rest of my moles. She biopsied one and I got a call a week later telling me what it was moderate dysplastic nevus, also referred to as a atypical mole. There are three types, mild moderate and severe. They don't like them to be referred to as pre-cancerous, but someone with a moderate or severe dysplastic nevus have a higher risk of getting melanoma. This means more SPF, less sun exposure, etc.
There are different ways to get melanoma aside from sun or UV exposure, at least from what I have read online (I love wikipedia). Don't automatically assume that you have melanoma, I am sure she is short with you perhaps to keep you from worrying. I didn't get a lot of information until AFTER my results. I have a second mole that is the SAME as my other mole that was removed, but they didn't seem worried to remove it even if it came back as the same. I just have to make sure to limit my uv exposure.
If you have several severe sun burns in your adolescence, that can increase your risk also. I hope some of this helps. I learned most of my information on wikipedia.
Good luck on your results, don't be too worried!!