Menstruation started on the 18th, when is the ovulation period?

Sep 10, 2025 Source: Cainiu Health

Dr. Zhang Lu

Introduction

Under normal circumstances, if menstruation begins on the 18th of the month, the ovulation day may fall around the 1st of the following month, meaning the ovulation period would be approximately from the 27th of the current month to the 3rd of the next month. When estimating the ovulation period, it is important to note that this method is less accurate for women with irregular menstrual cycles. It is recommended to use additional methods such as basal body temperature tracking or ovulation test strips to assist in determining ovulation. Some women may experience mild abdominal pain or light vaginal bleeding during the ovulation period.

Generally, if menstruation begins on the 18th of the month, the ovulation day may fall around the 1st of the following month, meaning the ovulation period would be approximately from the 27th of the current month to the 3rd of the next month. The detailed explanation is as follows:

Typically, a woman's menstrual cycle averages around 28 days, with ovulation usually occurring approximately 14 days before the next menstrual period. If menstruation starts on the 18th and assuming a 28-day cycle, the next period would be expected around the 15th of the following month. Counting back 14 days from this date, the ovulation day may fall around the 1st of the next month. The ovulation period generally spans 4–5 days around the ovulation day, as the egg can survive for 1–2 days after ovulation, and sperm can remain viable in the body for 2–3 days. Therefore, the probability of conception is higher between the 27th of the current month and the 3rd of the next month, and this period is considered the ovulation window. If the menstrual cycle varies slightly, the ovulation day and ovulation period might shift accordingly, but they will generally center around the 1st of the next month, leading to the above estimation.

When estimating the ovulation period, it is important to note that for individuals with irregular menstrual cycles, the accuracy of this method may decrease. It is advisable to use additional methods such as basal body temperature tracking or ovulation test strips to improve accuracy. Mild abdominal pain or light vaginal bleeding during the ovulation period is usually a normal physiological phenomenon and generally not a cause for concern. Those planning pregnancy can schedule intercourse appropriately during the ovulation period, while those not planning pregnancy should take appropriate contraceptive measures.

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How many days after intercourse during the ovulation period can pregnancy be detected?

Under normal circumstances, a blood test can determine pregnancy about 7-10 days after intercourse during the ovulation period, while a urine test usually requires waiting approximately 10-14 days. The exact timing may vary depending on the testing method and individual differences. If the test is performed too early, even if pregnancy has occurred, a false-negative result may occur due to insufficient levels of human chorionic gonadotropin (hCG).

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What color is the bleeding during ovulation?

In general, the color of ovulatory bleeding can vary, presenting as light red, pink, brown, coffee-colored, or dark red. The different colors are related to the timing, amount, and duration of the bleeding within the body. Additionally, if the bleeding during the ovulation period persists as bright red with an increased volume, or is accompanied by significant abdominal pain, fever, or other symptoms, prompt medical attention is recommended to rule out conditions such as endometritis or cervicitis.

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What is the normal thickness of the endometrium during the ovulation period?

Under normal circumstances, an endometrial thickness of 8-12 mm during the ovulation period is considered normal. It is important to regularly monitor whether the menstrual cycle is regular. If abnormalities such as unusual menstrual flow or prolonged menstruation occur, timely medical evaluation is necessary. Maintain a regular sleep schedule and avoid staying up late, as this can affect hormone levels. Eat a balanced diet and reduce the intake of spicy and irritating foods to provide a healthy environment for the endometrium.

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The translation of "22号来月经排卵期是几号" into English is: **"If my period starts on the 22nd, on which day is my ovulation?"**

Under normal circumstances, calculating a woman's ovulation period requires consideration of her menstrual cycle. If experiencing discomfort or difficulty in conceiving, it is recommended to seek timely medical consultation and monitoring. When estimating the ovulation period, it should be noted that menstrual cycles may fluctuate due to emotional and lifestyle factors, so this method only provides a rough estimate. For those planning pregnancy, combining basal body temperature tracking and ovulation test strips can improve accuracy.