The "pull-out method" is not a form of birth control, since there is sperm in pre-ejaculation. Pre-ejaculation always happens(it's the wetness that is present when a guy has an erection) and your boyfriend can't feel when it happens, so he wouldn't know when this is happening. You can easily get pregnant by using this method, which is just having unprotected sex. If your period is late, take a home pregnancy test in the morning. If the test is negative, look into birth control options to prevent pregnancy and start using it.
They can be pregnancy symptoms, but they don't mean you're pregnant. Symptoms tell and mean nothing. You need to take a pregnancy test with first morning urine. Unless trying to conceive, you need to be using proper protection.