Yes, pre-ejaculate can cause pregnancy. Pre-ejaculate fluid may contain sperm, so even if ejaculation does not occur inside the vagina, pregnancy is still possible.
Withdrawal, or pulling out, is one of the oldest methods of contraception. It has three main advantages: it is free, convenient, and has no side effects. However, this method is not very reliable and does not protect against sexually transmitted diseases. If you want to prevent pregnancy, consider other more reliable methods of contraception. If you are unsure which method is best for you, consult your doctor.