Hi, welcome to Health care magic forum.
Previously you had
mirena, which is a progesteron containing I.U.D, so you did not have the periods.
Paragard is an I.U.D, which contains only copper coil, and no harmone. So it can only prevent conception, but cant stop the periods.
In early days there may be
heavy periods, but the body may become accostomed for it latter.
If the over bleeding and the and the back ache is continued ,you have to consult a gynecologist for excluding the infection, and to remove it.
By no way it is
pregnancy, still if you want to exclude you can have H.P.T.
Wishing for a quick and complete recovery. Thank you.