HELP ME!

I'm 6 weeks (and 5 days) pregnant and im not sure whether i just miscarriaged or not. I was having sex and when i noticed that there was brown blood in the bed so i went in the bathroom and noticed that i had brown blood with a some red in it. I felt no pain, the blood wasnt enough to show up in my underwear and it stopped after about 30 minutes but i i saw it when i wiped the first few times that i went to the restroom after sex. Did i possibly miscarriage or did i irritate my cervix? Should i go to the er? Anyone?