pregancy with an IUD

ok, towards the end of september i started having pregancy symptoms, i have had the cooper T iud for a little over two years now and have never had any problems i have 2 children so i know what it feels like to be pregnant, i have all of the symptoms, headache, light headed, sore breats, heartburn ect. the only thing i have not had is any kind of morning sickness, which i had very badly with both of my children. i took a hpt it came out neg so i just figured it was all in my head, and i have still been getting my period. it last for 5-6 days, in oct though it only lasted 3 days and was very light, which is weird because my period has been heavy ever since i got the iud placed, this month it was 8 days early?? no idea why. and about three weeks ago my left breast started lactating (sp?) with my first pregnancy i started lactating at 14 weeks. so i'm at a loss, is it possiable that i am pregnant or is something else going on? Thanks.