How long, if at all, did you spot after having Mirena put in?

I didn't get my period back until my first went down to one nursing session at 18 months. It was great. Never went on any form of birth control. I had Mirena put in at 10 weeks pp this time and have been spitting for two months now. It's really annoying. I have my follow up tomorrow so I'll ask about it but I'm afraid I'll be an unlucky one who just spots continuously.