I have brown disharge instead of my period. i have unprotected sex but 2 urine tests (after a month sex) are 1 line. am i pregnant?

Late periods: It depends on how old you are or if you have had intercourse within the "danger" period, but yes missed periods for females almost always warrant a pregnancy test. Spotting can also mean hormonal changes which may be natural as you age, or related to a number of other factors, including stress, nutritional variation, anemia, etc. Recommend you visit an MD clinic to be checked out.