Is there ovulation and normally fertile mucus with the Mirena spiral?

With the Mirena IUD inserted, ovulation and changes in the nature of mucus may occur. High local concentrations of levonorgestrel in the uterus cause thinning of the endometrium and inhibition of its growth. There is a thickening of cervical mucus, which prevents sperm from entering through the cervical canal. In addition, the motility and function of spermatozoa are inhibited. In addition, some women are inhibited ovulation, but this is not a rule. This is explained here: https://www.gdziepolek.pl/opinie-i-pytania/76999/mirena-czy-moga-wystepowac-bolesne-owulacje-przy-spirali-mirena Mirena - like other hormonal intrauterine systems - is a very effective method of preventing pregnancy. I enclose additional information: https://www.gdziepolek.pl/kategorie/wkladki-domaciczne