Hello I'm 26 years old and just started on the Yasmin pill on my first day of period (28/10/15). I had unprotected sex on (7-8/11/15) and he ejaculated in me several of times. On 13/11/15 I was experiencing an pink vaginal discharge, then the next day I experienced light brown discharge and till now I have been having episodes of light/dark brown discharge. I also have on/off appetite, sensitive to smell and lower back pain.

Is it possible that I could be pregnant?