Hi H.,
I don't know about anyone becoming pregnant while the Mirena is in - but I'd sure like to hear about it if they do!!
I had the Mirena put in at my 6week post-delivery checkup with my OBGYN. That was 9 months ago.
Over the last couple of months, I noticed that a few of my normal menstrual cycle symptoms were coming back (bloating, back pain, sore breasts, crankiness, etc). But no actual period.
Guess what just I just started? Yup. It took my body about 3 months to get it together, but my period started last week Friday. I'm on day 9 and it's a pretty heavy cycle.
From what my OBGYN told me at the original appointment, the range of normal response with the Mirena is huge - some women don't have a period at all, some have very light periods, some have normal, some have heavy ones.
If you had your Mirena put in right after your last baby was born, you may be in the same boat with me. Your body is just taking a while to rebalance. The hormones that the Mirena releases probably kept you from having a period for this long, but your body has finally adjusted and will start a period soon.
Please let me know how this turns out for you. If for some reason the Mirena starts causing complications, I'd like to know! I doubt it will, but it's better to have connections with others anyway.
Good luck, H.!
~H. G.