So I was supposed to start my period last week on Monday and instead of starting I only noticed brown discharge when I wiped. My boyfriend and I are sexually active and we do not use condoms. He pulls out everytime. But I am on birth control. I was also very stressed out the Saturday and Sunday before my period was supposed to start and during the entire week when I was supposed to be on my period. Like stressed out to the point of crying almost everyday. I have not yet taken an at home pregnancy test. What could it be?