Hi, I ve had my IUD since October 29th, and when I got it my period date changed. It moved to the 12th to the 1st every month. Now I ve had it that way for all four months, but this month it s late. I know it wouldn t be exactly on the 1st this month, because last month ended early. However, I counted the days that would make it the first, if it was a normal month, and I should have gotten my period on Wednesday. My period is 4 days late, and I am sexually active, so I am concerned. Is this normal for having my Skyla IUD for only a few months, or should I be concerned? Thank you.