Anytime you're late for your period you could be pregnant, especially with symptoms, and you could very well have hit your ovulation day with the times you said you had sex, so I would wait and get the results from your pregnancy test. If it's negative and you're still not getting your period, wait another week and test again, if it's still negative you can make an appt. with your OB/GYN and get to the bottom of why your period's late! Good luck!
sounds prommising good luck...