Does This Sound Like Stress Or Pregnancy?

I'm on the mirena, this sept. is a year. I had a period on sept 16 for a few days, the day before that I was having bladder infection problems they lasted for a couple days with my period. Two weeks later on the 29th and 30th I had brown heavy spotting and had to wear a tampon, then it stopped on the 30th. Two weeks later, I had light yellow to light brown spotting when I wipe first thing in the morning on the 14th which would be considered the first day of my period. I usually just start red normal flow. Then the 15th first thing in the morning had very small light pink turned to light yellowish brown to then clear,(only when I wipe) then stopped in the evening again. Then the 16th spotting in the morning a little brownish red and kept doing lightly when I'd wipe, stopped in the evening. Now on the 17th I have about the same a little more consistent but still so faint and brown not red and not much cramping if any just some slight, i do wear a panty liner which doesn't even come close to saturate. I usually just bleed red with not many symptoms. If anyone can be of help I would greatly appreciate it. Sorry this was so long and full of detail. Thanks for the time to read it.