K.N.
Hi K.,
A friend of mine had the implant. She did get pregnant on it. Her body never took to it. She would have a period for 2 weeks, stop for a few days and then start her period again. She had it for 6 months. Her doctor just kept telling her that her body was still trying to get adjusted to it.
Good luck with what you decide! I am going for Mirena next month!