I am late on my menstrual and I'm having brown discharges can this mean tat I am pregnant

Yes it is possible. The only way to know is to take a test when you are at least 1 week late, then test using the first urine you pass when you wake up in the morning. If that is negative and you still don't get your period, wait until you are at least 10 days late and ask the doctor to take a pregnancy blood test.