Stress is a factor in delaying a period. Having sex isn't - just think of all those married women having sex on a daily basis. Their periods would never be regular! Periods get delayed for all sorts of reasons, and it cannot, in your case, be a pregnancy no-period situation.
I got it yesterday afternoon
Dear Jess
That's good to hear. Thank you for letting me know. You can now return to being a 'Kool Kat' again!
However it would be a good time to take stock and review how this happened 'in the heat of the moment' to ensure it doesn't happen again. If I can help, fell free to ask - in private if you prefer.
I hope I was of some help.