I was 7 days late. I took test siad negetive. Then I had a light brown discharge whiched turned into brownish red. I thought my period started. The second day 2 day redish brown and light. 3 day very light now at night only spotting. Could I be pregnant?

I am not an expert, but I would venture to say no. What you might have, which I had, is buildup of your endometrium, that is the lining in your uterus. Your body is trying to slough that off. Do yourself a favor. If it continues tomorrow, call your GYN. They can be certain about what is going on, and can take measures to either stop it, or in the case of the lining buildup, get rid of it.