wow are you lucky. that is the WORST thing to do if you're trying NOT to get pregnant. the pull out "method" (which is NOT b/c) is like playing russian roulette. eventually you WILL loose. it may be a good idea to get on some form of b/c AND use condoms.
Are you serious? The pull-out game? That is for seriously uninformed young teens trying sex for the first time in the back of a car. Get serious, find an MD to offer you some real birth control that fits your needs.
After ejaculation, there are still a small amount of semen in the urethra. This is why the pre-ejaculate fluid can potentially get you pregnant - it could squirt out a few more sperm before you expect it. How would either of you know if he doesn't pre-come any during intercourse? The chance of you getting pregnant this way may seem remote, but there is still a chance.
You guys have just been very lucky,,,4 yrs or not the numbers will catch up with you two...If you cant use the pill I would suggest a condom...Or see your Dr....there are
other forms of birth control...Its either finding something that works or buying diapers..
good luck guys...