I am 20 years old and my boyfriend an I had sex three months ago. It was protected sex and I have had normal periods since. I am now five days late for my period. I have been experiencing some spotting and some brownish discharge. My breast have been sore like they normally would before my period. But still no period!!! I have been under tremendous stress at work lately and I was wondering if this is causing it to be late. I was also taking course in college and just finished the semester. I was wondering if this change in schedule may be causing it.