I had sex with my fiancé on the last day of my period and one the day after period from 17 to 20 of oct, Its 13 days since I had sex with him.. is there a possibility that I would get pregnant... I still haven had any symptoms yet.

Yes its possible... in fact its possible any time you have sex... the only thing that varies is the chances of it happening.

Of course it's possible. You had sex and sex = pregnancy.

You are going to have to wait until your next period is due to see whether it comes.