Girls, hello everyone! Please share your experience, who has been usin…

Girls, hello everyone! Please share your experience, who has been using a coil. I'm planning to use it for the first time, I gave birth 5 months ago. I don't know which one is better to use, and in general, I want to learn more about it, is there any reaction, can someone have allergies to a coil? I will be very grateful ?