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how does pregnancy happen :

1. getting prengnant naturally only happen when the male partner discharge his semen into the inner side of vagina ( later will reach to the uterus ) and existing of ovums ( usually ovum exist and will be ready to fertilized in the middle of monthly period ) , and also existing ready uterus to carry on the pregnancy and the fetus .
2. ovualtion time or the time ovum exist are the day 12-16 of the period , for example ; if your first day of period was 1st/9 , your ovulation time is 12th-16th /9 
3. ovums last 48 hours in the uterus and can get fertilized any time during this period of time 
4. male semen last up to 5 days in female uterus and will be able to fertilize during this period of time , but the earlier the better 

is there a chance that you get pregnant depend on the situation you mention in your question ?

there is a good chance to get pregnant only if the male partner discharge his semen inside , and the sex occers at ovulation time or near to 

what to do next :

1. in first days after sexual intercourse , you better take emergency contraceptive pills such as progestin , the sooner the better 
2. avoid unprotected sex in future , to avoid unplanned pregnancy and also to protect your self from sexual transmitted diseases 
3. at the first week of next period , do a home pregnancy test and consult a gynacologist to do a routine check 
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