The withdrawal method/'pull-out method' is not a form of birth control and does not offer you any protection against pregnancy. Pre-ejaculation is always present when a guy has an erection and he can't feel it when it happens, so he would never know. Pre-ejaculation is the wetness that is there on his penis when he is aroused.
It does sound like you are in the clear for this month, like AnnieBrooke said, but you may not be so lucky next month. If you don't want to get pregnant, you need to be using some form of birth control. You can ovulate much sooner or later than expected, so there is no safe time to have unprotected sex.
It doesn't sound like there is a very high chance. It sounds like you ovulated around the time you saw the eggwhite cervical mucus. The egg only lasts a day (unlike sperm, which can apparently last 5 days).