Chances are slim. If you don't get your period next month, take a test.
I would say most likely you aren't since ovulation is usually about 10-14 after the first day of your period. If you had your period 5 days after the date of intercourse then I would say its highly unlikely.
yes it is possible. usually most women don't realize they are pregnant until they miss a period. and I have found that a lot of the time if you get pregnant so close to your period time your body most likely can still can carry out that period. nothing has been implanted yet and sometimes we all don't ovulate the same time. although you had sex on the 10th that doesn't mean you got pregnant that day some women can get pregnant on their period. I have had a similar situation happen to me and I found out I was pregnant. just see how your body is acting and if anything seems out of the ordinary. see if you have your period next month and if your still concerned take a test a week later some women don't show high hcg levels early in pregnancy to get an accurate positive hpt. i hope i was a little bit of help. besf of luck to you.
If you were on your period then is probably very slim chances. But some woman have periods throughout their pregnancies so you never really know until you test.