Started my period the 3rd ended on 8th still spotting it is now the 15th last time i had sex was protected and on the 15th of last month am i preg.?

Highly unlikely: If you had your period on the 3rd of this month and you had protected sex last month on the 15th. Then the likelihood of being pregnant is essentially zero. Having a period means there was no fertilization of the egg and the body went through menstruation in order to prepare for the next month. A good rule of thumb is Having a Period = No pregnancy Not having a Period = Possibly pregnant.