Why am I spotting?

On june 11 I had sex with my bf. On june 10 I got off my period. A week has barely passed and I started spotting today. It's like a light pink/ brown color everytime I wipe. I'm on birth control but I did forget to take one pill while I was on my period. Is this a sign I can be pregnant? Or why am I spotting?
Asked Jun 21, 2016

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