If you only use the condom before the guy cums and not throughout the whole thing can u get pregnant cuz i've been doing that with my bf and haven't gotten pregnant?

You can get pregnant: This is essentially the same as using the 'coitus interruptus,' or withdrawal, method. When used 100% correctly, statistics have shown that 4/100 women will get pregnant each year. If not done correctly 100% of the time, 27/100 women will get pregnant each year. Abstinence is the only method that is 100% effective at preventing pregnancy. Using a condom throughout intercourse prevents STDs.