Thanks for your query,
Sex was done almost at the time of ovulation, so there are chances of pregnancy
. But in case of protected sex chances are quite less .However failure of the method may occur occasionally. So first thing i will suggest you to go for a home pregnancy test immediately to exclude pregnancy. you will get the results with in 5 minutes.If you are pregnant you may undergo abortion
under supervision of OBG doctor as the process carries risk.
Some times period get delayed or even may not come due to excess stress
occasionally in a otherwise normal periods.
Best of luck and take care..
Hope it helps you....