What Causes A Delayed Menstrual Period?

Hey doctr i hd ma periods on 17 may n got intimate wd ma partnr on 24 may though we din had intercourse he juz rubbed hz genitals on mine.bt no sperm ws leaked inside vagina..m still virgin. den nxt mnth i got ma period on 10 june lil prior n da bleeding lasted fr nly two days n nw in dz mnth i hv nt got ma periods till nw.. 9 days late .. m afraid..m i prgnant.. plz advice plz