Does Delayed Period And Reddish Brown Vaginal Discharge Indicate Pregnancy?

i'm on duphaston for 4 months, 1 tablet for 15 days every month. My last period was January 18, 2011 and on the fifth day of my period, i took clomid, 1 tablet for 5 days. Then on my 11th day, i took duphaston three times a day for 15 days. I do have a regular menstruation, 28-30 days cycle. My period didn't come on my expected date instead a brown to reddish brown black discharges came out last February 19, 2011. No cramps instead headaches bothers me. is there a possibility that I am pregnant?