Looks like some type of chamomile...
You should be fine harvesting the plant. Nobody's gonna care about something as small as that.
If harvesting the plant, bring some scissors and cut off the top third of the plant, leaving ample leaves at the bottoms for the plant to regenerate. Don't pull it up by the roots unless you're going to transplant it.
Thanks for the clarification. I'm still new to the inner workings of all of this. That explains why my login will only work on one but not the other.