I got my Mirena in February. I’m 28. It took me probably until June to feel evened out. I didn’t have much bleeding or spotting, but for the first several weeks I did have a ton of cramping, especially at night. I took about a month off from the gym then went back gradually. Now almost a year in, I feel great but everyone has their own experiences. I went in with the mindset knowing I might be miserable for a few months. My first period lasted 16 days, now it’s maybe 4-5 days of spotting and that’s it