I Am 19 And I Had My Ovulation Day On

I am 19 and I had my ovulation day on 7th October. I met by bf that day and I was on top of him rubbing his area on mine and he came. Afterwards I had nausea with stomach ache and fever. But today I just have a stomach ache and like brown discharge. Since 11th October I am taking cinnamon in warm water too. I am scared for pregnancy. Am I pregnant?