Are pregnancy tests reliable when done a month after intercourse? I have irregular cycles (like 36-50 days). A week ago a brown discharge with clots started and lasts until today (there was a little bit of blood almost every day), could it be my period? I did the test a week ago and it was negative. Do you think if I do a test tomorrow morning and it shows negative, will the result be reliable? It will be a 49th day of my cycle.