Pregnancy occurs when sperm released at sex in the vagina meet an ovum in the fallopian tube of the lady partner.
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Ovulation happens only once in a month. And tge process of ovum development starts at menses.
So you will have to start chances for conceiving Only after menses
Its unfathomable why one would not want pregnancy in one month and want it in the very next month..
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Preg doesnot happen at times even if they keep sexual relationship everyday for a month, as there is no way to influence the natural events that happen in body.
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Pregnancy happens when a sperm released in vagina meets a ovum in fallopian tube of women..
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The ovum development is quite erratic. Its estimated that one must give a couple a year for them to conceive.
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Next Steps
Rather than taking such blind chances, better to seek know how about when to have sex for pregnancy by discussing it with a gynecologist