Explain?

I've Recently Started Taking The Pill (Less Than A Month Ago) And I Haven't Taken For 5 Days This Week. This Morning I Went To Use The Restroom And When I Wiped There Was Blood (Not Like Period But More Like Spotting). Also I Had Sex Last Week And Took The Pill Regularly But Only For 2 Days. Can Someone Explain What's Happening ? Should I Be Worried ?