Why can't I get pregnant during intercourse during ovulation?

1. Insufficient sperm count: Although the number of sperm in the female reproductive tract may increase during ovulation, not all sperm can enter the female reproductive tract. If the sperm count is insufficient, there is no guarantee that every sperm will be able to combine with an egg cell, even if a woman is ovulating.

2. Poor sperm quality: In addition to quantity, the quality of your sperm may also affect your chances of getting pregnant. If the sperm's chromosomes are abnormal or full of motility, then even if the woman is ovulating, there is no guarantee that every sperm will be able to combine with the egg cell.

3. Female reproductive tract problems: The female reproductive tract may have an impact on pregnancy. For example, vaginal inflammation or dryness may affect sperm survival and motility, thereby affecting your chances of pregnancy.

4. Women are not ovulating: Although in some cases, women may ejaculate during ovulation, this does not mean that every sperm can enter the female's reproductive tract. If a woman is not ovulating, there is no guarantee that every sperm will be able to combine with an egg cell, even if the woman is ovulating.

5. Other factors: There are other factors that may affect the chances of pregnancy, such as age, health, drug use, alcohol consumption, etc.

While having sex during ovulation may increase your chances of getting pregnant, it may not be successful in all cases. If a woman is ovulating but is not able to get pregnant, further testing and counseling may be needed to identify any possible problems.