I had an unprotected sex with my boyfriend a week ago to my mensturation cycle

I had an unprotected sex with my boyfriend a week ago to my mensturation cycle, but immediately I took contraceptive pills.
now after 2 days of my menstural cycle, I am facing with some spotting or little brownish bleeding.. so what does that mean?? Am I pregnant?

Please reply and suggest with some alternatives.!!

There is no time in your cycle where you can have unprotected sex and be absolutely certain you will not become pregnant. There are just times when the risk is much greater than others. Nobody here can answer that question. Take a pregnancy screening test and make sure you follow the instructions on how long after the exposure you should wait before taking it.

The web page below has nine links at the bottom. If you understand all of the information on those pages, you will clearly understand how it works and the risks of different behaviors.

Planned Parenthood:
http://www.plannedparenthood.org/info-for-teens/pregnancy/am-pregnant-33831.asp