Why do you not get pregnant even if contact happens on your fertile days?

Pregnancy is a complex process that requires several factors to align precisely. Even during the fertile window, when the chances of conception are highest, there's still a chance that pregnancy will not occur. Here are some reasons why you may not get pregnant even if contact happens on your fertile days:

1. Timing: While the fertile window is the period when an egg is most likely to be released and fertilized, the exact timing of ovulation can vary from person to person and cycle to cycle. Intercourse may have occurred too early or too late in the fertile window to result in fertilization.

2. Sperm Quality: Sperm quality plays a crucial role in conception. Even if intercourse occurs on fertile days, if the sperm count is low, the sperm are not motile enough, or there are other issues with sperm function, fertilization may not occur.

3. Cervical Mucus: The quality of cervical mucus can impact sperm's ability to reach the egg. If the cervical mucus is too thick or hostile, it can prevent the sperm from successfully navigating through the cervix and reaching the uterus.

4. Uterine Factors: Conditions such as uterine fibroids, polyps, or other abnormalities can interfere with implantation, even if fertilization occurs. These factors can create an environment that is not suitable for a fertilized egg to implant and grow.

5. Ovulation Issues: Some women may have irregular ovulation or anovulatory cycles, where ovulation does not occur at all. If ovulation does not happen during the fertile window, there is no egg available to be fertilized.

6. Stress: High levels of stress can disrupt hormonal balance and affect ovulation. Stress can interfere with the body's natural reproductive processes, making it harder to conceive.

7. Underlying Health Conditions: Certain health conditions, such as thyroid disorders, diabetes, or hormonal imbalances, can impact fertility and affect the chances of pregnancy.

8. Age: As women age, their fertility naturally declines. This is because the quantity and quality of eggs decrease with age, making it more challenging to conceive.

Remember, even during the fertile window, the probability of conception is not 100%. Multiple factors must come together precisely for successful fertilization, implantation, and pregnancy. If you are actively trying to conceive, tracking your cycle, understanding your fertile window, and addressing any potential issues with your healthcare provider can help increase your chances of pregnancy.