%-) Can someone please help me?

So my periods are usually normal and this last time it came early, and I was having brown discharge with minimal red discharge. I am a little confused. I don't know if I am pregnant due to the fact that pregnancy tests do not usually work for me.
The discharge only lasted three days and wasn't that heavy. Could this potentially mean I am pregnant? Is it normal to have a brown discharge with minimal red discharge in it? My periods are always 5 days long and never shorter.

Thanks for any help ladies.