Hello! I have a ravine on my property and have been slowly working on removing invasives throughout the past 5 years. Since removing a significant amount of buckthorn, many native plants have popped up which has been wonderful. But as I was doing my spring buckthorn check, I noticed a really large patch of what I thought could be creeping bellflower. I also found two singular clumps in my front yard and have seen flowers at my neighbor's house before, so there's a good chance it could be that. I can't seem to find any information online about what the stems look like when broken except that they secrete a milky white substance (which is what I've previously experience with CBF). The plants that I'm trying to identify have something more like a filament running through the stems and don't secrete anything. Is there any chance I've lucked out and this isn't creeping bellflower? Thank you for your help!