Yes, it sometimes happens that in the first three months after placement of the IUD you experience more discharge (white discharge) than, for example, while using the pill or other hormonal contraception. This is because the natural cycle recovers. After some time, the discharge will decrease.
After insertion of a coil, the discharge after menstruation may also sometimes be brown in colour, because some blood is still coming out. This will diminish over time.
It is very important NOT to wash the vagina with soap or foam. So only wash with water! Do not use vaginal rinses either, as they will only worsen the situation as it disrupts your vagina's natural balance.