Expected period is today-has not shown up?

My expected period is today and it still hasn’t come yet? The only form of sexual activity was giving my boyfriend head a month ago and wiping myself(and I think so because I did dry myself on a napkin but I can’t recall if it was that or the towel) dry on a towel that my boyfriend had wiped his dry cum on. My period is usually on time and never late even though how much I stress doesn’t affect it. I’ve been expediting my usual symptoms...could my scheduling have been wrong? Last month when I had my period I knew I was off by a day or two.