Since Paraguard is as effective as getting your tubes tied... no I've never felt the need to back it up as birth control. And I'm fertile-myrtle. It's statistically possible, but just like getting pregnant after getting tied, so highly unlikely that I don't waste a second thought, except for the once a year where they make sure it hasn't embedded (the only cases I personally know of where pregnancy has occurred is when the IUD has become embedded). I mean... it's possible. But it's more likely I'll be struck by lightening, or die in a car accident, or be murdered, or attacked by a shark.
8 years out & 2 to go on this one, :)
R