After one week of sex or missed period? You should be specific. There is no use of knowing about the conception after one week of sex. It is too much expensive also.
If you have had a sexual contact and want to know about it, wait for one week. Then take the morning sample of urine and go for the pregnancy test. Repeat it twice a week. If you do not get the periods, then consult the gynecologist. She will do the needful.
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