I have been spotting for a couple of days some slightly reddish and brown discharge. I was expecting my period shorty after. I was also experience slight period pain which is usual for me right before a period. My period came down and was red and I had a bowel movement which made it come down more. But after that there was no more blood just spotting and the next day I had another bowel movement and there was more red period blood and then more spotting. Usually I would have my period full force by now. I had unprotected sex with my partner a couple of times but he did not ejaculate in me. I am not on birth control. What could be the reason for this?