More irregularities. Progestin only methods like Mirena are most known for causing irregular bleeding patterns. This can include longer time frames with or without bleeding, random bleeding, or frequent bleeding, at any given time. And, such irregular bleeding is especially common during the first 3-6 months.

Im on week 3 of bleeding. Driving me crazy I can't stand it. But hey, no more babies lol

The first 3-6 months is supposed to be unexpected, you may bleed a lot you may not bleed at all. Trust me it sucks but it will eventually end. I had a period for 2 weeks, it wasn't heavy but it was still there and I couldn't get oral which SUCKED! Just be patient with it.