On the basal body temperature chart, it shows ovulation - so how come ovulation occurs again

Patient's question:

Hello:
1. If calculated based on the ovulation period, it should be 4 days before and 5 days after (this is based on the assumption that the menstrual cycle is relatively normal). Then, I would like to ask: During these 9 days, the temperature is lower in the early days and higher in the later days, is that correct?
2. I visited a hospital recently and took Gujing Wan; if the above assumptions are correct, then why did I still experience bleeding even when ovulation occurred?
Thank you for answering my two questions!

Doctor's answer:

Hello: If a woman has a regular menstrual cycle, the day of ovulation is actually relatively fixed. It should be around 14 days before the next menstrual period. For example, if this period started on March 5th, the next period might be around April 5th, making the ovulation day around March 20th. For women with irregular menstrual cycles, it might be more difficult to pinpoint the exact day of ovulation. One of the simplest methods is to measure basal body temperature to identify the ovulation date.
The correct method for measuring basal body temperature is to take your temperature every morning immediately after waking up without any physical activity, preferably in bed, and use a mouth thermometer.
After taking the temperature, record it on a basal body temperature chart. Continue tracking until your temperature rises by 0.5 degrees compared to the previous day and remains elevated for three to five days. The day your temperature rises may indicate ovulation. If you want to conceive during the ovulation period, the best time to have intercourse is one to two days after your temperature rises, as this has the highest conception rate.
Since you have experienced symptoms of ovulation bleeding, it is important to seek active treatment. During the mid-cycle, which is the ovulation period, a temporary decline in estrogen levels causes the endometrium to lose hormonal support, leading to partial shedding of the endometrium and resulting in regular vaginal bleeding, known as ovulation bleeding. In traditional Chinese medicine, this is referred to as "intermenstrual bleeding."
Treatment
1. Western medicine treatment: Diethylstilbestrol 0.25–0.5 mg per day, starting three days before ovulation and stopping 2–3 days after the bleeding stops.
2. Traditional Chinese medicine treatment: Liuwei Dihuang Wan, Gujing Wan, and Xuefu Zhuyu Wan.
Prevention and Care
1. Pay attention

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