Virginity.

Tomorrow I will be losing my virgnity to my boyfriend. Before sex, he wants me to suck him off. He's not wearing a condom when we have sex because he can't get one. He doesn't have a car, and due to our age as well I guess. He's using the pull out method. Anyways, I'm scared I will get pregnant because of me sucking him off before the sex. I know the cum will still remain on his area and when he enters, im worried it'll get inside. Any advice will help, honestly.