Late period

My period is about a week late. My first few days of my cycle I was sick with the flu. The days I was suppose to get my period, i only had light brown discharge. (For about 6 days) I was suppose to start birth control on the first day of my period but I haven't gotten it. I've been stressed lately bc I don't know what todo. I've had sex a few times since my last period but I used protection... Is it possible that my light brown discharge was in fact my period?