Taken Clomid, Had IUI, Regular Period. Sore Breasts, Yellowish Discharge. What Is It?

HELLO, MY HUSBAND AND I ARE TRYING TO HAVE A BABY, FOR ABOUT 2 YEARS....I VE BEEN CHECKED AND SO HAS HE, IVE DONE CLOMID AND HAD 2 IUI S...BUT NO BABY....NOW IM JUST PRAYING....IM 45 YEARS YOUNG AND HAVE 2 ALOMST GROWN CHILDREN......MY CYCLE IS REGULAR AND ALWAYS ON TIME FOR A MAX OF 4/5 DAYS.....LAST NIGHT I NOTICED THAT BOTH OF MY BREAST WERE SORE AND I SQUEEZED THEM BOTH AND TO MY SUPRISED, A YELLOWISH, WHITE, STICKY LIQUID CAME OUT.....??????? WHAT IS THAT?????