Determining ovulation is key to maintaining healthy fertility. If you want to get pregnant or ensure a healthy baby, it's important to know how to tell when you're ovulating.

To help you determine your ovulation period, you can try the following methods:

1. Record your body temperature: Measuring your basal body temperature can help you determine your ovulation period. Take your oral temperature (usually the oral method) every morning when you wake up. If your body temperature rises by 0.5 to 1 degree that day, you may be ovulating.

2. Observe symptoms: Some women may experience symptoms during ovulation, such as nausea, vomiting, headache, breast pain, increased vaginal discharge, etc. If you have these symptoms, you may be ovulating.

3. Use a pregnancy test stick: Using a pregnancy test stick can help you determine whether you are ovulating. Pregnancy tests usually show two bars, one showing you are not pregnant and the other showing you are pregnant. If the test is positive, you may be pregnant.

4. Consult a doctor: If you are not sure how to determine ovulation, or you have not been pregnant for a long time, it is recommended to consult a doctor. Your doctor may recommend other tests or examinations, such as a blood test or ultrasound, to determine whether you are ovulating and whether you are pregnant.

To sum up, it may not always be easy to tell when you are ovulating, but the above methods can help you determine your ovulation period. If you are in a fertile period, you should time your sexual intercourse as much as possible to ensure that sperm can enter the vagina and successfully fertilize.