Has anyone with a copper IUD had 100% regular periods and then it suddenly be off? Mine is always on time, down the the day, and I'm officially 3 days late with no symptoms or signs of it coming. I know I did ovulate when I was supposed to this cycle. I decided to test, because I know pregnancy can still happen for various reasons but it was negative (Pretty sure anyway, I'll add a pic here) and it would definitely be positive by 3 days late right?!