how long after you get the mirena IUD is it safe to have sex?
Oh well I read that wrong, lol. Sorry!
Usually your fertility is supposed to return soon after taking Mirena out. I think you may be pregnant OR your body is still adjusting to life without the extra hormones.
Sometimes with Mirena you don't have periods. I would take a test to be on the safe side but its probably nothing.
PS: Hormonal birth control is meant to stop ovulation as it's primary method to prevent pregnancy. If you hadn't stopped ovulating the birth control would be useless.