Should i be worried

Monica

I have been on Junel Fe 1/20 for almost three years. Like clockwork I have gotten my period every Tuesday right when I wake up. This morning all I had was some brown discharge. I had sex two weeks ago but he did not finish. I take my pills on time or 30 mins early/late which has never been an issue. Does the brown discharge mean my period is coming, or is this normal with the past three years of periods be clockwork.