Breastfeeding and birth control?

Has anyone used the Mirena IUC while breastfeeding? I know it contains hormones. The info about it say "Ask your doctor if you are breastfeeding"...so yeah, I'm going to ask him...but I was a moment ago wondering if it was even a possibility while breastfeeding? Has anyone used it? If not, what DID you use for birth control while breastfeeding? I'm looking for pill alternatives, because I get regnant on the pill, without skipping any. How just about the implant? Another IUD? Or the of late the pill?
Answers:

Brests size?

i breastfeed 4 2years 7 didnt fall pregnate..(didnt hold a period any..yay)i was told to hold the mini pill ,but i have never be very righteous at remembering to take it so i didnt bother.But i enjoy heard of women getting preg while breastfeeding..remember doesn`t matter what u take go to ur milk

To all womanly Smokers who have kicked the need, how did it affect you? Mood swings etc. how long did the?

I'm not sure how to answer all the question you asked. But I know it's true that breastfeeding is like a pure birthcontrol. Your body will not start it's cycle since you are nursing a child. I'm no doctor so it would be best to talk to your doctor something like this of course. Also I'm sure it might not be true for adjectives women. I just hear about this from professor surrounded by college that was adjectives into promoting breastfeeding. Hope this helps