Hi dear user, pregnancy rate
use is less than 0.5 per 100 women years which is very low. So, chances of pregnancy are very low if your mirena is in its right place.Probably, all these signs are due to its side effects. However,to be on safe side, you can go for serum beta HCG
levels to rule out pregnancy. If that is negative then you can take anti emetics and pain killers for your symptoms.