Ovulation pulling, most of the time in a few hours to about two days to start ovulation, according to the pulling, and can not determine the time of ovulation. Estrogen can stimulate the secretion function of the secretory cells, with the estrogen level increasing, to the ovulation mucus secretion increases, mucus thin, transparent, pulling degree can reach more than 10cm, about in the menstrual cycle of the 6th to 7th day appeared, the highest degree of pulling in the ovulation. However, judging the time of ovulation based on the mucus pulling is not scientific or accurate, and the current effective method is to determine the ovulation situation through ultrasound. If the pulling degree of mucus increases during ovulation, you can do ultrasound examination to determine the time to prepare for pregnancy, if necessary, go to the hospital to consult the doctor.