Am I pregnant if it's been a month since I had sex. Started period and took pregnancy test 2 weeks after that day now I have light brown coming out and I have sharp pains in stomach and I'm sick?

I would say you are not pregnant. If you have had a period you are not pregnant. With brown flow and sharp pains and sick I would suggest you have an infection - these are not signs of pregnancy. Please go and see a doctor. If it is an infection and is not treated in time you could cause serious damage.