Am I pregnant? Help me out please?

Well Ive had unprotected but he pulled out. I know that method doesnt work sometimes so that whys im asking.. Me and my mother started last time at the same time, mother already started and i havent. Along with all that, i think i have a yeast ifecttion.. I was at my bf house today and i went to the bathroom and ihad this Light pink thick discharge on my underwear. I have no clue what it was..Ive had lower stomach cramps like im goin to start and lower backaches. More headaches then usual... We had spam for supper on night and i like it, But just smelling it and after i ate it i got sick... PLease help. Id appreciate it.. Am I pregnant or just about to start??