I am always very careful about discussing this topic, so I do not go endorse something that is not scriptural. If you know that you are not ready for a child, abstain from sexual intercourse if you have not yet started having sex, but if you have, then always try to play it safe with your partner. You both should have a discussion about your plans so you can have an understanding that pregnancy at that stage can ruin the plans that you both have for yourself. If you are a lady having unprotected sex with a person that you know you cannot allow be the father of your child, or will not be ready to father a child, you should stop being sexually involved with them unprotected. And as a female if you know you are not ready to be a mother and you understand that it can ruin your plans for your future, do not let yourself get pregnant, so that the though of abortion does not come up.