getting frustrated.

The last period I had was in The ending of October to the beginning of November, I never got it for the month of December. I was never worried or stressed, my boobs have been bothering me for 3 weeks. I thought maybe I was pregnant, I took a pregnancy test yesterday and there was a "faint line", I waited and it seemed to disappear. I woke up this morning & what do you know I started my period, it's usually starts out light then gets heavy, but right now it's still light & when I wipe I can see what looks like my CM.