The normal ovulation period refers to the middle of each month for women, which is about 14 days before the next menstrual period. This time is often an important time for women to become pregnant, so understanding normal ovulation can help people plan their pregnancy better.

1. Measure basal body temperature: Measuring basal body temperature can help people determine the normal ovulation period. Typically, women experience an increase of 0.3-0.5 degrees Celsius in the middle of each month and maintain this trend for the next few days.

2. Observe the menstrual cycle: Observing the menstrual cycle can help people determine the normal ovulation period. Typically, a woman's menstrual cycle lasts 28 days, but some women have longer or shorter menstrual cycles.

3. Observe symptoms: Some women may experience symptoms during normal ovulation, such as breast swelling, nausea, headache, fatigue, etc. These symptoms usually disappear within a few days.

4. Use a pregnancy test: Using a pregnancy test can help people determine whether they are pregnant. Some pregnancy tests can detect signs of pregnancy during normal ovulation.

To sum up, the determination of normal ovulation requires some measurement and observation methods, but by observing symptoms and using pregnancy testing tools, people can better understand whether pregnancy is normal.