<ul>
<li><a title="Pregnancy Due Date Calculator" href="/pregnancy-due-date-conception-calculator">Pregnancy Due Date:</a>&nbsp;When will my due date be?</li>
<li><a title="Pregnancy Events Due Date Calculator" href="pregnancy-due-date-conception-calculator">Pregnancy Events Calculator:</a> &nbsp;When are important dates during my pregnancy?</li>
<li><a title="Pregnancy Weekly Calculator" href="pregnancy-calendar-and-calculator-week-by-week">Pregnancy Weekly: </a>Show my weekly progress</li>
<li><a title="Pregnancy Weekly Calculator" href="pregnancy-calendar-and-calculator-week-by-week">Pregnancy Days Countdown:</a> Show my days countdown</li>
<li><a title="Pregnancy Weekly Calculator" href="pregnancy-calendar-and-calculator-week-by-week">Pregnancy Baby Weight Change:</a>&nbsp;Show my baby's weight</li>
<li><a href="/pregnancy-due-date-conception-calculator">Reverse Due Date Calculator:</a>&nbsp;When did I conceive if this is my baby's due date</li>
<li><a href="/pregnancy-due-date-conception-calculator" target="_self">Reverse Birth Date Calculator:</a> &nbsp;When did I conceive if this was my baby's birth date</li>
<li><a href="/am-i-late-with-my-menstrual-period-am-i-pregnant-calculator" target="_self">Menstrual Period Planning Calculator</a>: Will my period come that day?</li>
<li><a title="Menstruation Calculator" href="menstruation-period-calculator-calendar">Menstrual Fertility Calculator:</a>&nbsp;What will my menstrual period be over the next 12 months?</li>
<li><a title="Menstruation Calculator" href="menstruation-period-calculator-calendar">Menstrual Fertility Calculator:</a> Will I be fertile that day?</li>
<li><a href="/when-am-i-fertile-today-calculator" target="_self">Fertility Calendar:</a> When should we have sex to get pregnant?</li>
</ul>

The beginning of pregnancy is called conception and usually begins at the time of implantation of the blastocyst, the formation of a viable zygote, and the attachement of it to the uterine lining. This usually happens about 1 week after fertilization and ovulation.

Conception

Want to know when you conceived? Or when you will be fertile? Learn all you need to know about when important fertility milestones take (or took) place!