Pregnancy line is a turning combination in K-line form. The second K-line in the thread-holding combination completely contains the first K-line, while the pregnancy line is just the opposite, and the first K-line completely contains the second K-line. The key combinations of pregnancy lines can be roughly divided into three types: pregnancy line, pregnancy line and pregnancy cross line.

The stock price of Yin-Yang line closed a rising Dayang line during its operation, but the stock price of the next day did not continue the strength of the previous day, but opened sharply lower at the opening, but the opening price was higher than that of the previous day.

After the opening, buying was relatively positive, and the stock price rebounded, but during the rebound, there were also selling outflows. After a day of long and short battles, although the stock price finally rebounded, as of the close, the stock price failed to recover the lost ground at the opening, and finally closed at a positive line below the closing price of the previous day. The entity part of this positive line is all within the entity of Dayang line the day before. This form of K-line combination is called "pregnant Yang line"

It is worth noting that when this form appears on the disk, the first day's positive line and the second day's positive line can have upper and lower shadow lines, while the standard breeding positive line has no lower shadow line, but generally speaking, there is little difference in market significance with upper and lower shadow lines.

It can be seen from the formation process of the combination of pregnant and yang lines that in the next day's operation, the buyer's power decreased obviously. If the buyer's power cannot be strengthened in the next day or two, then the stock price will definitely reverse and fall in the afternoon. When this form appears in different positions of the stock price, the market significance it represents will have different meanings.

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When the pregnant positive line appears in the middle of the stock price rise, it shows that the motivation of the stock price rise is weakened, which indicates that the stock price is more likely to fall or even fall. When the pregnancy positive line appears at the high level of long-term stock price rise, it shows that the stock price has experienced serious stagflation, and the stock price is likely to fall in the afternoon, which is often a precursor that the stock price is about to fall sharply.

The stock price closed a rising sunny line during the operation, but the next day, the stock price did not continue the strength of the previous day, but opened sharply lower at the opening, but the opening price was higher than the opening price of the previous day.