I started my period on 12/5/12 and it ended on 12/8/12 but I had unprotected sex on 12/9/12 is there a chance I could be pregnant?
Of course there is always "that" chance.
Yes. You should worry about VD too.
You could get pregnant since you already have your period. So maybe..
if you have sex right after your period that it actually when you are least likely to get pregnant.. But it is always still possible.
No there is no egg available the day after your period