What is the percentage chance of a 39yr old almost 40 of conceiving during pullout method ..has not been sexually active for years... usually my breas?

It depends upon: It depends upon the time of the month of your menstrual cycle. Very high risk for pregnancy if you are ovulating. The pull out method is not a reliable form of birth control as a pre cum has viable sperm. At a minimum consider using condoms as a barrier to prevent pregnancy and STD transmission. Consider choosing a reliable form of contraception such as birth control pills, injection or IUD