AF Due Today

According to this app, AF is supposed to make her appearance today. My last period ended the 3rd of this month and since then I've had all the symptoms you could find listed on the internet besides the missed period. My period is due the 26th, the 25th I had very light brown spotting when wiping, the 24th I had very light pink spotting when wiping. Is there a chance I could be preggo?