The Mirena is very effective and while a lot of people think it stops ovulation, it doesn't.
Thank you so much for the quick response.
That's one of the reasons why I was so worried yesterday when I started spotting. Although I don't personally know anyone who got pregnant while using mirena, but I do hear that some people do get pregnant with it intact. The spotting did stop after a few hours yesterday...Today I just feel tired with some boob soreness. I am trying to keep busy, so I can wait for AF on the 17th.
By the way, was everything fine with your friend's pregnancy? Honestly, the possible complications are the main reasons why I am worried.