My periods were heavy the entire time I had the IUD; i know that many women It will be a year for me in November and I didn't get my period but I did have pregnancy symptoms for the last 3 months. Someone told me that the only way to find out if you are pregnant is by .. Due date or child's birthday. The Paragard is effective for up to 10 years and the Mirena is effective for 5 years. can be life threatening and may result in loss of pregnancy or fertility. bodies, and subsequently more problems with copper imbalance than men. our uterus to protect us from the 2 days a month we are actually fertile. If you don't get pregnant right away, don't panic -- it's not uncommon for women to try for several months, or even for a full year, even if they've never used an.