I would like to ask if there is possibility that i'm pregnant. last thursday i started to have brown discharge which i've never had, i was supposed to get my period this tuesday, and it came today, but it looks different. ?

Hard to guess, but..: A urine pregnancy test, done correctly, gives a reliable result 3 weeks after sex (3 weeks after when conception might have occurred), 1 week after missing a period, or after having a "weird" period. If done sooner, a positive result is likely real, but a negative result may be due to testing too soon, and thus lead to a repeat test.