so about a week ago I had sex but the condom broke so I took plan b about 7 hours later. Now I'm having brown discharge and period symptoms like cramps and such, I know it screws your cycle so is this my period starting early orrr?? please I'm freaking out and only 16 years old and can't get pregnant. I know I shouldn't have had sex but can't take it back now so please just be nice and help me.