during that time your not fertile so chances of getting pregnant are not high but not entirely impossible, if you used protectin than i would not worry to to much but, sperm can last about 5 days under extremely good conditions in your vaginal fluid
From the day it starts.
Usually, that close to a period sex will cause a delay in the period for a day or two.
Not really. Often your period can be delayed a day or so by sex. If you haven't had a period in several weeks take a test.
Your period can always be late whether you have sex or not. You are not likely to be fertile on the day before your period, and the fact that you used protection gives you even less reason to worry.
Yes
probaly
yes
There is a 5 day waiting period.
finishes up with oral sex
if you have unprotected sex you can get pregnant. Period.
Yes
YES. Even if you're actually on your period, you can get pregnant.