Well I have posted on the pregnancy thread but thought I would put something here as well. Having been the biggest fan of mirena it has let me down - I'm about 6 weeks pregnant! It is a bit of a shock and is going to take a little bit of getting used to (to say the least) but I thought you would like to know! Don't worry - I looked it up, this is a failure in the realms of 1:10000. Typical it should happen to me.