Disclaimer: I am not a doctor, just a medical student. Please see a medical professional!!!
The Mirena IUD is the one with progesterone in it -- so after you've had it in for awhile (meaning several months), your menses is supposed to either become really light or stop all together. In the first few months of having it in, menses can become irregular -- sometimes involving heavy bleeding, which may be what your friend is experiencing.
In terms of getting pregnant, like Zenor said, you can get pregnant on any form of birth control -- but an IUD has a 0.1% chance of pregnancy after the first 30 days. If you do happen to get pregnant with an IUD in, there is a high likelihood of it being ectopic -- which is BAD.
I would suggest your friend go to a clinic and get it checked out, if for no other reason than peace of mind. I've heard (blogs, classmates, etc.) that many people have experienced side effects from Mirena, so maybe your friend is one of those people. Good luck and I hope your friend feels better soon.
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