What are my chances of infertility from the mirena (levonorgestrel) iud? is this a common side effect?

Not Great: The fertility issues with IUD's centers around infection and tubal disease. Without infection, the IUD is perfectly safe. The risk of infection is low but women with multiple sexual problems or with partners having multiple partners would be at higher risk. The hormonal aspect is not a fertility problem but can cause hormonal disruption by lowering estrogen. Some are symptomatic from this also