Ovulation refers to a period of time in a woman's menstrual cycle, usually about 14 days before her next period. During this period, a woman's endometrium undergoes large-scale growth and shedding, which is one of the important processes in a woman's pregnancy. However, for many women, they are unable to accurately estimate their ovulation period, which may cause them to miss the best time to get pregnant.

If women want to get a better estimate of when they are ovulating, they can do so by:

1. Measure basal body temperature: Women can estimate their ovulation period by measuring basal body temperature. Basal body temperature refers to the time when a woman's body temperature is measured when she wakes up in the morning. During the ovulation period, a woman's body temperature will rise by about 0.3-0.5 degrees Celsius. This day is the woman's ovulation period.

2. Observe changes in the endometrium: Women can estimate their ovulation period by observing changes in the endometrium. During ovulation, a woman's uterine lining becomes thicker and may experience significant growth.

3. Use David test strips: David test strips are a commonly used tool to test whether a woman is pregnant. It can detect a woman's ovulation period by measuring HCG levels in her body.

None of the above methods are guaranteed to be 100% accurate because everyone’s physique and cycle are different. Therefore, women should estimate their ovulation period based on their specific circumstances and make appropriate plans during this period. If women want to get pregnant, they should also find the best time to get pregnant during the woman's menstrual cycle and maintain good living and dietary habits.