Should i be concerned?

My period started on Thurs July 9th. But it was very light,and brown. The second day reddish color, and the third day it was brown. And then it stopped, today it is very light again. I took a test an hour ago but it was neg. So I will try again in the morning. But I always have a normal cycle every month. The last time I was sexual with my bf was June 7th. And my period was normal, it started June 11-16. Thank you:).