Me and my boyfriend were having sex and he pulled out and came all over my vagina, could i be pregnant?

Yes: Although it is unlikely, it is possible to become pregnant when using the "withdrawal" method - this is because there is often still some sperm that can be found in pre-ejaculatory fluid that is released from the penis before ejaculation. So, withdrawal isn't perfect birth control. It has a failure rate (meaning pregnancy) of about 20% over the course of a year.