What Causes Heavy Break Through Bleeding And Cramps After Taking Loestrin?

Hi, may I answer I have been taking Loestrin24 for about 6 or 7 months now. In the beginning I experienced break through bleeding which I was told to expect. However, this is now my fourth day of cramping and light bleeding (brownish, a bit thick) a week before my period is due. Three days before the bleeding began I missed a pill and took it very late. At first I thought this could be the cause but the bleeding began days later and I did not think it would continue for four days. I took a pregnancy test which was negative, but I'm still curious about what this could mean.your health queries right now ? Please type your query here...