Thanks for posting your query.
It's normal to have one to five days of cervical mucus just before ovulation, and also to have watery cervical mucus just before menstruation
begins.Cervical fluid appears in response to the hormone estrogen
. As you are also having Mirena
IUD which is a hormonal contraceptive
, it can make your mucus more thicker, that is how it works to prevent sperm entry.
So, do not worry and relax. If you have more concerns then visit your doctor.
Hope it helps.