help me....

hi everyone! i'm being paranoid right now because my boyfriend and i had a sex previous days feb 9 on exact, it's our first time haha, im so paranoid right know because we had a sex and do a withdrawal because we don't want a baby yet of age 20. Because we have a lot responsibilities, so my friend tell me that they have a chance that pre-cum can get pregnant and know im so paranoid and don't know what to do please help me, can you give me some advice?