I Have Started A Birth Control Pill On The First

I have started a birth control pill on the first (sunday) which was the day of my period. My period ended on the 4th (Wednesday). I was experiencing cramping and my sleeping schedule including my appetite has changed. On the 20th (Friday) i started bleeding which i assumed was my period) and it ended on the 23rd (Monday) After having intercourse today 2 hourd later i started having brown spotting. Could i be pregnant or is this normal?