Spotting

So I was taking birth control but stopped because it was making me feel drained and causing me to break out and have very bad moods. Since stopping it I have had way better moods and skin and so on. But also since stopping I have had a sexual partner and I am

Supposed to get my period in 12 days and yesterday I was spotting, not enough to go through underwear and not dark, more of a pink color and today it stopped. What does that mean?