I've had my copper iud in for 3 years 4 months. I have an irregular period but generally a 43 day cycle. My periods have been like clockwork every 40 to 44 days for most of this time. It is now 4 days late. I got a doctor to check my strings last summer as I can't reach them. She said they are fine and all is good. I'm not sure why i'm 4 days late? Its been a long time since ive been this late. Anyone else experienced this? What should I do? I don't think i'm pregnant?