I had the mirena in for about 13 months & had it removed end of august to try to get pregnant. I had thought it was more immediate. I found out it can take 3-6 months for your cycle to return. my husband and I are pretty bummed because we would have removed it earlier (or never had it put in).
Anyway, I bled a few days after removal (probably due to the removal) & then nothing until a couple days of brown spotting at the beginning of this month.