theoretically abstinence is the only way to ensure that one does not get pregnant. however practically speaking there are many ways to avoid pregnancy. it ranges from using condoms to contraceptive pills to intrauterine devices to achieve longer contraception. if no method is used and pregnancy is feared then one can even use emergency contraceptive pills. it has to be used occasionally but definitely not more than once a month. for further information consult an obstetrician and gynaecologist online --> <link>
does taking contraceptive pills before and after sex avoid pregnancy?