Thanks for the query.
Usually it is said that in ideal circumstances sperm can be alive for 5 to 7 days in female genital tract.
So if you are having regular cycles with 28 hours duration and ovulation occurred on around 14th day then there is some possibility for pregnancy
If your cycle duration is around 30 days then the time of ovulation will be around 16th day then the chance is less.
But don't worry it is not usual to get pregnant because of the act before one week.
As there is some possibility if you miss your periods better to go for blood test
or urine test for pregnancy once which will rule out the possibility.