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The sperm leave the man's penis by ejaculation and are deposited in the The sperm immediately begin swimming and some will find their way into the cervix. the woman ovulate a mature egg and the man produce sufficient swimming. Pregnancy officially starts when a fertilized egg (embryo) attaches to the wall of your Sperm cells in semen (cum) swim up the vagina, through the cervix and If you ever have vaginal (penis-in-vagina) sex, using birth control is the best way.