IUD complications....

Kayla
So I got an IUD placed on September 6 and had it in for a week but I was bleeding so bad that I had to take it out. Since then I have had spotting and I just assumed that was because I was still getting over the hormones that was in my system. I was supposed to start my period the 25th of September but I still haven't yet. I don't know if the IUD could've messed up my cycle or could I be pregnant, for a long time now my boyfriend and I haven't been using anything and he hasn't been pulling out. I took a pregnancy test on the 28th of September and it came back negative. Could I be? I'm just wondering if anyone else has been through anything like this. Thanks!!