There is still time after ovulation, which is a critical period in the female reproductive process. During this stage, the egg is released from the ovary and travels into the fallopian tube to await fertilization. However, for some women, they may experience no fertilization after the egg is released. This condition is called a post-term pregnancy.

Causes of expired pregnancy

Postterm pregnancy can be caused by a variety of factors, including:

1. Egg quality problems: Some women may have egg quality problems, such as insufficient egg quantity or poor quality.

2. Sperm quality problems: Some men may have sperm quality problems, such as insufficient sperm motility or an increased rate of deformities.

3. Fertilized egg problems: After the fertilized egg is formed, some women may experience problems such as slow movement of the fertilized egg or abnormal implantation position.

4. Environmental factors: Postterm pregnancy may be related to environmental factors, such as high temperature, radiation and chemical substances.

Ways to prevent post-term pregnancy

It’s important to prevent post-term pregnancy, here are some ways:

1. Regular physical exams: Regular physical exams can help women detect and deal with any potential reproductive problems early.

2. Adjust your diet: Adjusting your diet can help women increase the quantity and quality of sperm and eggs.

3. Avoid high-temperature environments: High-temperature environments may affect a woman’s reproductive ability, so exposure to high temperatures should be avoided.

4. Avoid radiation: Radiation may affect a woman’s reproductive ability, so exposure to radiation should be avoided.

5. Follow your doctor’s advice: If a woman has any reproductive problems, she should follow her doctor’s advice and get treatment.

Postterm pregnancy is a complex problem that requires women's joint efforts to prevent it. If a woman finds that she is experiencing a post-term pregnancy, she should seek prompt medical help.