Scarlett, 8 days after your period you will not be fertile, unless you have short cycles (shorter than 23 days).
I am a little bit confused, Primolutin-N will stop you from ovulating. And that will stop you from menstruating. Why would you be taking an contraceptive pill when you think you may be pregnant - except if it was meant as emergency contraception?
You are most likely not pregnant but all the confusion and stress from this incident caused your hormones to go out of whack and are delaying your period. You have seen your doctor and they did not think anything was wrong (except for a temporary disturbance).
So my advice will be to relax and calm down and see if things return to normal. If you want you can take another pregnancy test in a week or 2 weeks time just to totally put your mind at ease.
I hope you now know what anguish and stress unprotected sex can put you through and you will take the precautions to protect yourself from STDs and pregnancy in future.
Best of luck!