E.R.
Hi there,
I just had this same discussion with my OB last mo. at my annual. I also have the Mirena and LOVE it! However if I wanted to start trying to conceive next year, so how soon should I take it out? She said b/c of the progesterone levels that are continuously released from the IUD it could take a couple of months for your body to regulate a menstrual cycle again and start ovulating. So if you got it out in January I think this Spring will be your time. Just give it at least 3 months and give your OB a call if nothing happens after 6 mos. or sooner. Consider stress a factor too with your two little ones!
Best of luck!!