If my period started november 17, 2012 and ended on november 21, 2012 what are my fertile days?

Approximately Nov 3: From ovulation to the onset of the period is tyypically 14 days. If a patient is having regular 28 day cycles, she is ovulating around day 14. With 32 day cycles, subtract 14 from 32 and that gives you day 18 as ovulation day, etc.

If your cycle is 28 : Days then your fertile period would be 3 days before and teh day of and 3 days after dec 1st, if it isnt 28 days then it could be beofre or after that day as if u are ovulating , u usually ovulate 14 days before yoru period.