Is a scanty menstruation of dark color with the Mirena insert on normal?

The Mirena system reduces the abundance of menstrual bleeding. It can cause various types of changes in menstruation, such as: spotting (slight blood loss), shorter or longer bleeding, scanty or intense bleeding or lack thereof. The more scanty the bleeding, the slower the blood flows out of the uterus. Its longer "retention" causes that it takes on a dark brown or even darker color. C Observed changes may be the result of the presence of the system in the uterus, but if you would like to be sure that everything is in order, you should consult a gynecologist. I enclose additional information: https://www.gdziepolek.pl/kategorie/wkladki-domaciczne