Unprotected sexual intercourse and does intercourse occur?

Good if a person has unprotected intercourse and does the interrupted intercourse can get pregnant? And if after that this person starts taking contraception, can she be pregnant even taking contraceptives every day?
Expert answer:

In a unprotected sexual intercourse where the interrupted intercourse there is chance to occur pregnancy.

O interrupted intercourse is not indicated as a contraceptive method. Interrupted intercourse, characterized by ejaculation outside the vagina, can present failures ejaculation occurs, in addition to being able to contain sperm in the pre-ejaculatory fluid. Therefore, the failure rate of coitus interruptus is around 20%.

After a report of withdrawal, the woman may become pregnant. When the woman is pregnant, even using the contraceptive pill every day she will continue to be pregnant, because the contraceptive pill is not abortive.

When there is a chance of being pregnant, it is best to wait for the menstruation to come to start using the contraceptive pill and, during this interval, continue to use the condom in all sexual relations.

Sexual practice with a condom can generate more trust among the people involved and less worry about the time to ejaculate.

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Unprotected sexual intercourse what are the risks?