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The most reliable time to take a pregnancy test is one week after you have missed a period(expected date of your period).Waiting one week after a missed period will usually give a more accurate answer.Or have a blood pregnancy test.Blood tests can pick up hCG earlier in a pregnancy than urine tests can.Blood tests can tell if you are pregnant about 6 to 8 days after you ovulate.
So first get a blood pregnancy test done.If it comes out to be negative,then following is considered brown vaginal discharge usually occurs when the products of menstruation aren't completely cleared during a menstrual cycle.The various causes of delayed/irregular/mild bleeding of periods can be due to stress,being overweight or underweight,imbalance of hormones,polycystic ovarian syndrome/estrogen dominance,uterine abnormalities (fibroids/cysts/polyps/endometriosis).
So I advice you to first go to have a blood pregnancy test done.
Hope my answer had helped.