Talk to me about birth control while inducing

I'm still working my ways through the wikis and I saw another thread about birth control being "having your cake and eating it too" but I didn't want to hijack. I have a mirena iud, It's my third and i've had one about 13 years, a couple of months ago when I first tried to start pumping I was getting duct fluid, my breasts felt full...it felt just like the last few weeks of pregnancy so I didn't think it would be a problem, will it? If it will will a copper iud do the same thing? I'd rather have to eat every pair of shoes I own than be saddled with a newborn at this age and while I'm not sexually active right now 1 in 3 women you know?