Hello and welcome to HCM
There can be a variation of couple of days in a normal menstrual cycle.
You are four days over your normal cycle.
You can still wait for a week. The brown colored discharge that you are experiencing can be the menstrual blood flow.
In case you are suspicious for pregnancy
, the best thing to do is to get a pregnancy test done.
Thanks and take care
Dr Shailja P Wahal