Checking ovulation is a very important step in the fertility process, because ovulation is a critical period for egg cell maturation and fertilization. If you want to get pregnant or have a healthy baby, it is very important to correctly determine your ovulation period.

1. Measure basal body temperature: Measuring basal body temperature can accurately reflect the body's cyclic changes. Take your oral temperature each morning when you wake up and record the value. Generally speaking, ovulation occurs when the body temperature rises by 0.3-0.5 degrees Celsius.

2. Watch your sexual desire: Sexual desire increases during ovulation as the body’s way of preparing for fertilization. If your libido increases, this could be a sign of ovulation.

3. Observe vaginal secretions: During ovulation, vaginal secretions will become thinner and brighter in color. This is the body's way of preparing for fertilization.

4. Watch for symptoms: Some people may experience mild symptoms during ovulation, such as headaches, breast swelling, fatigue, etc. These symptoms don't necessarily mean you're ovulating, but they can serve as a reminder that it's time to get tested.

5. Use egg test paper: Egg test paper is a tool that can measure the maturity and health of egg cells. During ovulation, the egg test strip may show two lines, which is a sign that the egg cells are mature and ready for fertilization.

The above are some methods for checking ovulation, but it should be noted that these methods are not 100% accurate. Therefore, if you want to get pregnant or have a healthy baby, it is best to seek advice from your doctor or fertility specialist.