Ottakee:
There's really two parts to your Q, I think.
Firstly, the symmetry/asymmetry aspect is, in my view, a matter of personal taste, really.
But the second aspect: women having 2 or 3 in one or both earlobes is these days so benignly wholesome and almost standard. (One could almost say that the truly radical, avant-garde, cutting edge chic would be to have one single stud in ear lobe: an assertive exercise in minimalism!) So if it's something you'd feel even remotely comfortable with that would be to your liking, I reckon you'll have no problem if you hurry back and get tripled.
(Two cents'.)