I have been on tri-sprintec for 3 weeks now and starting the white pills, my cycle in normally due to come on on the 20th of the month, I have been cramping, having back ache, and my breast are very tender, which are the normal things I go thru when my cycle is about to start. No blood is falling, just a light brown discharge. Is this normal? could I possible be skipping this month and will I have a cycle at a later date?