What Causes Delayed Periods With Spotting A Week Before Menstruation?

hi
i have been on birth control for over 5 years and have never missed a pill nor been late to take it i am ocd with taking it on time everyday, i recently started training for a half marathon more exercise than i have ever done in my entire life and not to mention just moved in with my boyfriend and had alot anxiety in the beginning in the month about moving out of my parents house. I didnt have sex during the week of ovuluation and i was spotting two weeks before my period and than when it came time to my period which was the day after the marathon i didnt get it? i have always had a regular periods so i was 5 days late and took a test and it was negative and now its about week and half what should i do is this normal?