Stressing about the IUD

So I had my little one 7 weeks ago and at the end of September I am getting the Mirena IUD placed. At the consultation with the doctor the idea of having the IUD sounded great, she gave me the prescription and I went to the pharmacy and bought and booked my insertion date. Well now that I’m reading everything thing on here from everyone’s experiences I am terrified to have this done, I kinda wish I never bought it now. The reason I bought it so quick was because my health care coverage runs out sept 1st so I was pressed for time. Now I’m terrified that it will hurt, that I will bleed forever, and that I won’t be able to have more kids in a few years. Can I hear your ladies experiences with this stuff on the Mirena IUD