Yes, you had sex on a good day for conception....Midcycle is generally when MOST people are most fertile, although it varies from person to person....If you are TTC, I suggest using a calander (many websites offer them....fertility friend, babymed, etc) so that you have a better idea of when you ovulate and when to have intercourse....Lots of luck
i say you shouldve had sex a couple extra more times just to make sure that little booger was in there lol...but its a chance
if ur menstrual cycle is 28 days and regular ,that would mean u had intercourse on day 14 of ur cycle which would be when u are ovulating so yeah theres a chance.