Welcome to the forum. Hope you had the mirena
coil fitted by an expert. Slight bleeding does occur after it has been fitted, but it should soon settle down. Your periods should get shorter and lighter.
Take nutritious diet rich in calcium and iron. Wait and watch your problem should settle down. however, if you are not comfortable, having headache, stabbing pain
, swelling in the legs, you should report to your gynae.
Then you need to get examined to find out any uterine swelling, infection or partial expulsion of the IUS. Take care.