not necessarily.
pregnancy depends upon on female's ovulation & male's sperm union.
After female's ovulation the female egg remains fertile for 72 hours.
After ejaculation male's sperm live alive & active for 24 to 48 hours for fertilisation.
If male's sperm & female's egg unite & fertilise during that period, then & then pregnancy takes place.
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it is very much possible to become pregnant on the very first time if your period falls during the ovulation time i.e 10th to 16th day from day 1 of your period considering the periods to be regular..the sperm remains viable for 48hrs and can cause pregnancy even if u have intercourse on 8th or 9th day..so always use condoms to be on a safer side..every single intercouse has the potential to cause pregnancy..
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How Does One Become Pregnant ?
not necessarily. pregnancy depends upon on female s ovulation & male s sperm union. After female s ovulation the female egg remains fertile for 72 hours. After ejaculation male s sperm live alive & active for 24 to 48 hours for fertilisation. If male s sperm & female s egg unite & fertilise during that period, then & then pregnancy takes place.