I have the plastic and copper iud, I have a pretty normal period but I just started tracking it. Usually lasts 7-9 days since I got the iud. I am 8 days late for my period even with a 34 day cycle (giving the uterus the benefit of the doubt. ) day before yesterday I bled just enough to saturate one half of a qtip. Then it stopped. Then an hour or so ago another qtip half. And theres awkward cramping. And about a week ago I had this weird razor blade tentacles sensation in my uterus the same as when I got pregnant with my daughter. Is this implantation bleeding? Is something else wrong? I took a test and it was negative. I have no idea what the hell is going on in there. Advice and input appreciated. Thanks in advance.