cramps but before period, help please!

well here's the deal. when i first start birth control pills i started having sex a week or so into the first pack. the pull out method was used. when i finished my last active pill, my period came 2 days later a lot lighter than usual. it started off with a smidge of pink and brown. so it would seem, a day or so past and everything seemed okay except that i had brown discharge throughout my whole period. i am currently 4 days away from finishing my last actiuve pill on my second pack and i have lower abdominal pains which started even a few days earlier than now. I have been extreamly tired, a tad sick (runny nose etc) feeling nausiated and plenty of headaches. what does this mean? help please!![/code][/quote]