“These three methods can indicate ovulation, easy and feasible, but some people do not know their characteristics, so they do not feel good to master. The standard basal body temperature is biphasic, and there is a low point in the transition from the low to the high temperature zone, and the temperature will rise immediately the day after the low point, which is the moment of ovulation. This is one of the disadvantages of taking your temperature, it is an afterthought and becomes an afterthought! However, it is very effective to determine your luteal function, endocrine status from the temperature curve or to determine if you are pregnant from the number of days of high temperature. 2. Lassitude: In a normal menstrual cycle, the first few days after menstruation, the cervix is mucus-free and the vulva feels dry. Later, with the gradual increase in the level of estrogen in the blood, the cervical canal begins to produce mucus, which first appears cloudy, sticky and yellow, and then becomes thin and transparent in a few days, like egg white, and can be pulled into 10 cm long filaments without stopping. At this time the vulva has a feeling of lubrication. The last day of this lubrication is called the “peak mucus day” by Billings. Thereafter, under the effect of progesterone, the mucus production decreases significantly and the mucus becomes cloudy again, sticky and easily broken. The vulva feels moist or dry. Ovulation should occur on what Billings calls the “peak mucus day”, which is the last day. However, there are long and short days with mucus, and it is not easy to know which day is the last day. 3.LH test paper: The follicle is matured by the action of follicle stimulating hormone (FSH) and luteinizing hormone (LH). During the 24 hours before ovulation, there is a peak in LH and it is bound to occur. So, we use an ovulation test paper to detect this peak. When the second line of the test paper is close to, the same color, or exceeds the color of the first line, you know that ovulation is coming within 20-48 hours. This method is intuitive, understandable, and gives ample time for preparation. However, the more difficult thing is that there is difficulty in determining the color… is it the peak when the color is close? Or will it deepen again tomorrow? So, it is required to measure twice or even three or four times a day at this time, and if the color starts to get lighter, then the previous measurement is the peak. It is also inconvenient to use test paper to see the color, so please do not throw the test paper after the test, stick it in a row, dynamic observation, the first time inexperienced, to the back of the second third to the color is about the same time, the heart will have a number, and will know about when ovulation.