My best guess would be that she is
probably not pregnant. The chances are
VERY slim, because if she has a normal
cycle, she would not be ovulating for
about 7-8 days after you had sex. I
believe sperm only survive for about 72
hours to five days. But there is always a
"chance". As for the waiting period, just
try not to think about it too much,
because like I mentioned, stress can delay
your period, and that makes the situation
worse. Hope everything works out for
you!
P.S. If she is really that nervous about
it, you can buy a good pregnancy test that
can detect the pregnancy hormone up to 5
days before you even miss you period.
But, these don't always work, and if it
comes out negative, they always say to
test again if you miss your period. I
used one three days before I missed my
period, and it came up positive.