Trying to conceive but not being able to get pregnant is a common problem for many couples. Although ovulation is an important period for pregnancy, not all couples can become pregnant during this period. In fact, some couples, despite their best efforts, have sex during ovulation and still don't get pregnant. So why do some couples try and fail to conceive?

Secondly, some couples may not get pregnant at the right time. They have sex during ovulation, but may not have enough sex at other times. This may affect the success rate of pregnancy. In addition, factors such as the couple's age, health status, and whether they smoke and drink alcohol may also affect the success rate of pregnancy.

Third, some couples may not have enough sperm and egg fertilization. Even if you have sex during ovulation, if the sperm and egg cannot combine properly, the likelihood of pregnancy is reduced. Therefore, couples should have regular check-ups to ensure that sperm and eggs are combining properly.

Finally, some couples may experience unnecessary frustration. For example, they may have experienced problems with sperm and egg binding, or experienced some other health problem that may affect the success of pregnancy. Therefore, couples should have regular check-ups and seek help from a doctor to ensure a successful pregnancy.