Late implantation? Tmi

My Mirena just came out Aug. 4. I bled a couple days stopped and then bled for 10 more pretty heavy. I am cd 34 now and 10-13 dpo. This morning I had brief brown spotting and cramps. My cervix is low and feels open but it usually does at the end if the day ( I worked nighhr shift on my feet all night). Cm is now back to sticky and no spotting? I feel all messed up bc of Mirena and don't know if it could be implantation? Thoughts?