I had my ring in for 3 weeks, took it out for one week, and was supposed to put it back in at 12:30 pm. I forgot, had unprotected sex 12 hours later,then remembered to put the ring back in. Now I'm wondering if I should take a Plan B for the 12 hours I was unprotected, or will the Nuvaring be more effective for preventing pregnancy (even though I put it in 12 hours late)?