I have been on the mirena for 3 years now. I also have a 3 year old son. My breasts have been hurting alot over the last couple of weeks, as well as changes in mood/sleep/appetite. I saw tonight that my left breasts is producing colostrum. This has never happened at all since after getting a shot to dry my breast milk up after i had my son... I took a pregnancy test tonight...though it was kind of a forced pee and there wasnt much. It said not pregnant. Is it possible that I really am pregnant and that the test just didnt notice the hormones in my urine?? What else would cause all of this? Could the mirena make the test say no?? also, my nipples have been hurting pretty bad to. I took another test this morning and it also said no. The substance is sort of clear with a little tuny bit of yellowish color. Its also sticky. What else could ths be?