Do you have a picture yet?* You might be able to id what you have using one of these search engines and putting in any details you know.
I'd love to know if you id it.* If not, please post a picture of whatever you do have.* Knowing if the plant grows in sun, part sun or shade, when it blooms and it's height would be most helpful.
When weeding, the best way to make sure you are removing a weed and not a valuable plant is to pull on it. If it comes out of the ground easily, it is a valuable plant.