Hello, I Am On The Birth Control Lutera. The First

Hello, I am on the birth control lutera. The first month I did not take the period week pills. Now I am on the second month. Yesterday I did not take my pill until five hours later, within that time I had sex and he ejaculated inside of me. Today I have light brownish pink spot in my underwear. I am not supposed to get my period for another week and a half. Could this be because I didn't take my pill at the correct time, an infection, an early period, or that I may be pregnant?