When it comes to making a baby, the odds are stacked against any single sperm cell ever becoming a zygote through contact and penetration of a female egg. That's if a man has perfectly healthy sperm — and if he has enough of them. Let's look at the numbers: Each second, a man's body produces at least 1, sperm cells [source: Dell'Amore ]. On average, a man's ejaculate about 2.
You know that sex leads to pregnancy , but how soon after sex do you actually get pregnant? Implantation occurs five to 10 days after fertilization, which means anywhere from five to 15 days after you had sex. Pregnancy symptoms may start as early as a week after you had sex or may take several weeks to start. Some women never get noticeable early pregnancy symptoms.
The Conception Calculator estimates a range of days during which a woman is most likely to conceive, as well as a corresponding due date based on a woman's average menstrual cycle. The fertile window is the three-day window during which the probability of a woman conceiving is highest. Conception is usually defined as the initiation of pregnancy, when an egg is fertilized. This can occur either through in vitro fertilization, or sexual intercourse.
There are close to equal numbers of sperm that contain either a male chromosome or a female chromosome. This determines the gender of the baby at the very point of egg fertilization. It will also play a role in the race to reach the egg.