normal period on Mirena?

I had mirena put in toward the end of my period. After it was in, I continued to bleed for quite a while. That whole month my bleeding went up and down and only just briefly stopped. Because of this, I didn't know when my next period would be, once the bleeding finally did stop. The next period seemed to be at a reasonable time although I don't remember how many days after the original bleeding it started.

Now I'm waiting for my next period after that one. I haven't kept track as well as I should but what I do know is that it's been at least 30 or 31 days since the first day of my last cycle. I had some odd cramping and bloating a couple weeks ago. I also have had occasional headaches, although nothing too bad. The headaches have almost been negligible. The cramping was as if I had my period, but it was obviously too early for it and I wasn't bleeding, although I did experience some spotting for a day or two. The cramping is also starting to return. I'm also experiencing soreness in places that shouldn't be sore.

I know mirena throws off your period for the first 3 to 6 months. I also know that spotting is typical... but is it typical for it to delay your period by almost a week? I think my normal cycle is 26 days, opposed to my current count of at least 30 but possibly 31 or more. For a few reasons that I don't want to take the time to explain, I'm not sue exactly how long my natural cycle is... perhaps my cycle actually is 28 days... but I think it's closer to 26. Also, what about all the other stuff? Just typical symptoms?