Does every conception lead to pregnancy?

No, not every conception leads to pregnancy.

Here's why:

* Implantation: After fertilization, the fertilized egg (zygote) needs to implant in the uterine lining. This is a crucial step for pregnancy to occur. If implantation doesn't happen, the zygote is shed during menstruation.

* Chromosomal Abnormalities: Sometimes, the fertilized egg has chromosomal abnormalities. These can make it difficult for the embryo to develop or lead to miscarriage.

* Health Factors: Underlying health conditions in either parent can impact the success of implantation and development.

* Other Factors: Factors like age, lifestyle choices, and environmental factors can also play a role in whether a conception results in pregnancy.

In summary: While conception is the first step towards pregnancy, it's not a guarantee. There are many factors that can influence whether a fertilized egg will successfully implant and develop into a viable pregnancy.