When is the ovulation date if the menstruation comes on the 30th?

To calculate the ovulation period using this method, you must first understand the length of your menstrual cycle. In other words, you must have a very normal or regular menstrual cycle to calculate the start time of the next menarche and thus the ovulation period. Therefore, it is only suitable for women whose menstrual cycles are always normal. If your menstrual cycle is irregular or abnormal, you cannot calculate the time of the next menarche, so you cannot calculate the ovulation period and ovulation date.

For irregular menstruation, the ovulation period calculation formula is:

The first day of ovulation = the shortest menstrual cycle minus 18 days; the last day of ovulation = the longest menstrual cycle minus 11 days.

It is very important for young women to grasp the ovulation period correctly: if you want a baby, you should start on the first day of the ovulation period, maintain the frequency of sexual life once every two days, and persist for several months. If there are no special circumstances, you will usually get pregnant. Women who do not want to get pregnant need to miss having sex in the next few days. At this time, the ovulation period will be called another term: the dangerous period of pregnancy.

Finally, we will introduce other measurement methods to everyone:

1. Cervical mucus method

The cervical mucus is often dense in a small quantity, or even with no mucus at all after the menstrual period is over, and it is called the "dry period", indicating a non-ovulation period. The middle and late stages of the menstrual cycle are accompanied by changes in endocrine secretions, with an increase in mucus and a thinner appearance. Vaginal secretions are often called the "wet period." Close to the ovulation period, the mucus becomes clear, smooth and quite elastic, like egg white, with increased wire drawing degree and not easy to tear. The last day when this kind of mucus appears is ≥48 hours, which is the ovulation period. Therefore, when the private parts feel moist, it is the ovulation period, also known as the "fertile period". If you plan to get pregnant, you should choose the "humid period" before ovulation.

2. Test with ovulation test paper

Ovulation test strips predict whether it is the ovulation period by testing the highest level of progesterone converted into growth hormone (LH). 24 to 48 hours before a girl ovulates, the level of progesterone converted into growth hormone (LH) in her urine will reach a peak, and the result will be positive when tested with an ovulation test strip. The actual testing method is usually indicated on the packaging of the ovulation test paper (it must be strictly followed to avoid errors as much as possible).

3. Spot bleeding observation method

When the egg is discharged from the uterus and ovaries, it tears the wall of the uterus and ovaries, causing partial bleeding. Usually, this little bit of blood is quickly digested and absorbed in the abdomen. But there are also a very small number of women who bleed more heavily. The blood will flow through the fallopian tubes, uterus, and vagina to the outside of the body, and there will be drops of blood stains on the underwear. Some women call it "small menstruation", and it is called "ovulation bleeding" in medicine.

4. B-ultrasound detection method

Through B-ultrasound examination, experienced doctors can see the whole process of the egg being discharged from small to large. This method should be the most accurate.

5. Observation of secretions

During a menstrual cycle, secretions do not remain constant. In most cases, the discharge is drier, thicker, and less frequent. On the day right between two menstrual periods, the secretions are clear, bright, and plentiful, like egg white, or more like the runny nose when you have a fever or a cold. This day is the ovulation period. This is because during ovulation, higher concentrations of estrogen are produced, which act on the columnar squamous epithelial cells at the cervical opening, causing them to secrete a large amount of secretions.

6. Ovulation temperature method

Measure your body temperature immediately after waking up every morning when you are not active. This body temperature is called "ovulation temperature." Mark the ovulation temperature measured daily on graph paper. Women with regular ovulation can find that the ovulation temperature is usually less than 36.5 degrees Celsius about two weeks before ovulation, while the ovulation temperature is usually higher than 36.5 degrees Celsius about two weeks after ovulation. That is, in a month, there is a double curve graph of body temperature during ovulation, with low temperature at first and high temperature at the end. The day when this double curve graph just starts to rise is the ovulation period.