Ovulation monitoring ultrasound precautions are as follows: 1. Do not stop follicle monitoring when you see a dominant follicle or mature follicle, always note that follicle monitoring is a complete process that does not end until after you see a mature follicle ovulating. In most cases, although the follicles are mature, they may be stunted and may not ovulate. The follicles may also be luteinized, in which case although the follicles are mature, they are not really ovulating, which is the reason why the ovulation process is emphasized to be monitored continuously and completely. 2. For patients using clomiphene to promote ovulation, follicle monitoring should be performed from the second day after the drug is administered, and also to reflect the function of the ovaries. 3. For patients with polycystic ovaries, in principle, it starts from the tenth day, but at this time more In the absence of a dominant follicle, monitoring can be performed at 3-4 day intervals until a dominant follicle is seen. After the appearance of the dominant follicle, it is the same as the normal ovulation monitoring process. 4. Ovulation monitoring must be closely combined with clinical temperature monitoring.