Also I don't know how old you are or anything about you but I have had this happen to me.
I m/c in Sept 06 and have been experiencing this since October and the doc confirmed by no other answer that it was because I had a m/c and some women don't dry up that fast...it takes a long time.
Just because you lactate does not mean you're pregnant. You may have high levels of prolactin. Is prolactin in your BC? The only thing you can do is take a pregnancy test or see your doctor! If you are pregnant you do need to stop BC.