What are the chances of pregnancy without a condom if the pull out method was used and birth control pills were taken irregularly the week before?

all women are different. I was on it two years with not one period. I tried for six months after stopping the depo and finally went to the Dr. the had me do 3 months of Birth Control to regulate myself. I did get pregnant the first month off of birth control though. did you have a period during your depo?