i have a question but first this was my situation..
i monitor my period every month when will I going to have it..
then, i have a sexual activity with my boyfriend a few days before the range of my period that i expected to have..

-is it, having a sexual activity can cause a delay of my period?..
scientifically analysis.. does the eggcell have been release or replace with a new one because i have sex a few days before i must have a period so that's why i experience a delay in my monthly period??