The left follicle and the right follicle after a few days of review are no longer there may be normal ovulation, or the follicle is not mature atresia, it is recommended to use ovulation test paper to determine whether there is ovulation. 1. Normal ovulation: follicle development and maturity will be on its own follicle rupture egg discharge, vaginal ultrasound will find the enlargement of the follicle is no longer, belong to the normal physiological phenomenon, if the ovulation is not more than 24 hours, timely coitus pregnancy chances are greater. 2. Follicular atresia: After the follicle develops into a dominant follicle and does not continue to grow and develop, it will be atretic and disappear, and vaginal ultrasound will show that the follicle is not there, it is recommended to use ovulation test paper to see if it is positive to determine whether there is normal ovulation. If you want to prepare for pregnancy, it is recommended that you monitor the follicle development frequently when the follicle is approaching maturity, to determine whether the follicle is matured and discharged or whether it is atretic and does not ovulate.