Taking the pill on time and withdrawal

We just had a baby and I've been on birth control for 3 months.. In order for me to get pregnant the first time I was given proestrogen due to my pcos. Anyhow we have been using condoms mostly with my birth control pills. However we have had to do the pull out a couple of times and I wasn't always taking my pill at the same exact time. What do you think the chances are of getting pregnant again