I've had the Mirena IUD for a few months now. The last two months I had cramps and a headache a few days before my period and then it started and it was regular. This is my third month with it and my period is late by a couple days and I haven't had any symptoms that I normally have when I'm about to start my period. Is this normal with me still being fairly new with it? I'm in a LDR so I haven't had sex for two months so I'm not pregnant.