Semen is formed when the prostate gland releases fluid into the urethra, combining with sperm from the testes.

Where does fertilization occur?

Fertilization occurs in the fallopian tubes when sperm meets the egg.

What happens after fertilization?

After fertilization, the zygote develops into a blastocyst that implants in the uterine wall, marking the start of pregnancy.

Home pregnancy tests may show positive results by week 5 of pregnancy.

By weeks 9 to 12, the fetus has developed facial features, circulatory, reproductive, and urinary systems, and can urinate in the amniotic sac.

During ejaculation, the prostate releases alkaline seminal fluid containing nutrients to protect and nourish sperm, aiding their journey through the female reproductive system for fertilization.
After fertilization in the fallopian tubes, the zygote develops into a blastocyst that implants in the uterine wall, marking the beginning of pregnancy, culminating in a fetus with advanced organ systems by weeks 9 to 12, showcasing the intricate process of human development from conception to early gestation.

How does semen form?
Semen is formed when the prostate gland releases fluid into the urethra, combining with sperm from the testes.
Where does fertilization occur?
Fertilization occurs in the fallopian tubes when sperm meets the egg.
What happens after fertilization?
After fertilization, the zygote develops into a blastocyst that implants in the uterine wall, marking the start of pregnancy.
When can home pregnancy tests show results?
Home pregnancy tests may show positive results by week 5 of pregnancy.
What are the characteristics of a fetus by weeks 9 to 12?
By weeks 9 to 12, the fetus has developed facial features, circulatory, reproductive, and urinary systems, and can urinate in the amniotic sac.

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During ejaculation, around 300 million sperms move from the testes through the vas deferens into the prostate area, where the prostate contracts to release fluid into the urethra, forming semen. The seminal fluid is alkaline to protect sperm, contains sugars for nourishment, and is liquefied by enzymes from the prostate gland.
Sperm swim through cervical mucus to reach the uterus, where fertilization occurs in the fallopian tubes. The sperm must navigate a challenging journey to meet the egg, with only a few surviving to increase the chances of a healthy baby. The sperm then fuse with the egg, creating a zygote with a full set of chromosomal DNA.
The zygote develops into a blastocyst, which implants in the uterine wall, signaling the start of pregnancy. By week 5, home pregnancy tests may show positive results. The embryo progresses into a fetus by weeks 9 to 12, with developed facial features, circulatory, reproductive, and urinary systems, and the ability to urinate in the amniotic sac.