What Does Brown Discharge With Cramps While On Birth Control Suggest?

Hello I Am 18 Years Old && I Am On Birth Control. Last Month I Had My Period It Was Pretty Normal I Have My Period For 3-5 Days At The Most Two Weeks Later I End Up Having My Period Again Now This Month I Am Having The Same Thing Happen Again Except This Time My Blood Is A Brownish Color It Isn t Red I Also Have Been Having Cramps And I Don t Know Why I Was Cramping Weeks Before My Periods && I Even Cramp After My Periods I Looked Up On The Internet Some Ideas That Could Be Wrong With Me And The One That Kinda Scared Me Was That I Could Be Pregnant I Am Really Concerned About What s Wrong With Me Please Help