With hormonal contraception, it is not uncommon to skip a period or to have extremely light periods. But the tissue that is sloughed off has to come out some time, so that is why you may experience what is considered "breakthrough bleeding". If it bothers you, you can try a different type of birth control. I personally liked the super-light periods where I only needed a panty liner to control it. But as stated, everyone is different. Glad Anonymous is experiencing some relief since having her mirena removed. Hope you are able to find a different birth control method that's right for you. If you need help with more resources, let us know.