I took the Plan B one step pill about 5 hours after having unprotected sex. During this time, however, this day was one day before my normal scheduled period, which was yesterday. Today, my scheduled period began with normal cramping, but it is extremely light (which mine are normally heavy), and was preceded by brown discharge. Because this is the time of my normal period, is this my period meaning I am not pregnant because there is blood? (Even though it is light.) and does that mean my next few periods will be different like this? Thank you for your time!