Bleeding but not on period

I shouldn't get my period for another ten days, but today when I went to the bathroom there was blood when I wiped (sorry if that's tmi). I got an IUD in early December, and for the past month or so I've had some brownish colored discharge, sometimes light sometimes heavy. I've read something online that this can be "old blood" from the previous period so I didn't think much of it. But this time I got the brownish discharge with obvious amounts of blood. I had checked my IUD string and I can still feel it. It has moved a little (only when using toy to play lol). I am wondering if this is a side effect of the IUD or something else entirely?