i normally have periods every 5-6 weeks due to my polycystic ovaries. i had a normal period on 16th feb. i had unprotected sex on 1st of march then on the 9th of march i came on what im guessing was a period only it was brown. this 'period' lasted from sunday to the following saturday.. i only had to wear a pad on the tuesday. Im not taking birth control. since then ive not had a period had a bit of brown discarge this week but its gone now, whats up with my body could i be pregnant? please help.