TMI : what is this ??

i’ve been getting this brown spotting sort of ? i’m on birth control and my period is a week away , normally i wouldn’t be THIS concerned but i’ve been on the pill for a year and have never gotten spotting other than right around the time of my period . i’ve also just recently been doing somewhat intense ab and inner thigh workouts and that’s the same time that this started happening ? could that have caused it ?