Antibiotics are given to help your body fight an infection or to prevent an infection. These medications do not contain hCG. They can, however, alter how your birth control, specifically oral contraceptives (the pill), work. This means that you may be more likely to get pregnant if you are on the pill and take antibiotics. Be sure to let your prescribing doctor or nurse know that you take the pill if you are given antibiotics. They can guide you on how to use a backup method of birth control and for how long.