Effective for 3 years. I hit my 3 year mark app. One month ago and haven't been using any other back up birth control. In the past month I have had unprotected sex numerous times.Could I be pregnant so soon or is this something that would naturally take a while?

It most likely would take awhile, but certainly it would be wise to start using an alternative form of birth control. You'll have to see what happens in regard to your cycles. If you suspect pregnancy at some point, testing is the only way to know for sure.