I honestly couldn't guess because I'd need your expected period dates and to know if you had sex near your ovulation, so here's my best advice - if you're experiencing flu-like symptoms, along with pain and a cough I would let your doctor know. Any time you have unprotected sex, there's a possibility of becoming pregnant and your doctor could give you a quick urine pregnancy test while you're there. Because even if you are pregnant, you could still be sick with a virus or infection with symptoms like a cough, and you'd want to get that taken care of properly.
One place I really like to go to get an idea of when to expect my period and dates where conception is possible, along with when the best time to test would be is the website CountDownToPregnancy. They have tons of tools on there that helped me when I was experiencing my own pregnancies.