If you had/have the Mirena, how long did you bleed after insertion and how often do you bleed/spot?

I've had mine almost 2 weeks. Not sure if it was a coincidence, but I feel like I instantly bloated and got a heavy period that is like on 2 days, off a day, on again 2 days, off, and so on. I know the doc said some bleeding and cramping is normal. Just reading some horror stories and need to hear how long this can go on before I should be worried.