On birth control for 4 months, unprotected sex but he did not inside of me

What is your question?

Since this is under pregnancy, I will assume you want to know if you could get pregnant. If that is the question, the answer is yes, of course. As you know from the information provided with the birth control, (warnings, side effects and more) that no birth control is 100 percent, so even taking your birth control properly there is a chance of pregnancy and many women get pregnant each month just using birth control pills.

There are sperm in the early fluids, so withdrawal merely lessens the amount, but does not prevent. So yes this behavior can lead to pregnancy.

If you want help here, you need to ask a question not make a statement.

As Chuck noted, ANY time there is penile penetration there is to possibility of pregnancy. Noi form of birth control is 100% effective.

So in any given month you have a chance to become pregnant. Birth control lessens that chance. For example, a normal fertile person might have a 50% of becoming pregnant (NOT ACTUAL DATA! DO NOT RELY). If you use a condom, 85% rate, then that drops down to 7% chance. Most hormonal birth controls are 95+% effective which means on their own you have a 2.5% chance of becoming pregnant. Use with a condom will down that below 1% chance.

While it is true that having sex can cause pregnancy, being on birth control for 4 months and assuming regular taking of the pills, the chances are REALLY low. Pulling out doesn't really reduce the chance of pregnancy. I think you are fine, but if you miss your period by two weeks then you should be concerned.