You have to wait till you're due at least one day , your hormones level is not high enough to detect pregnancy.Wait till you're due and then get a test.good luck!
Technically yes, but its not really that simple a question to answer. If you have an average 28 day menstrual cycle, starting from the first day of your last period, count 14 days. If that day falls on or a few days after the 17th when you had sex, then yes you could have gotten pregnant then. 5 days is awfully early to get a positive, it usually takes at least 10 days to have enough HCG in your system for a positive, but I guess stranger things have happened. Its probably a bit more likely that you got pregnant before that though. Anyway, I am no expert, but thats how I understand it. I don't think there is anyway to know for sure. Good luck to you.