31 mm we are not sure if the egg realised is good or not. If the size is 18-20 mm we give a trigger like inj HCG for the follicle to rupture. Or if we want to wait, we wait till 20-22 mm and then give trigger. You can try for conception in this cycle, if it is not successful, go for ovulation induction and follicular monitoring in next cycle, and then at 20 mm you can get a trigger injection.

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