Trigger shot and IUI

Has anyone had a 15mm follicle on cycle day 13 and got told to trigger on cycle day 15 for IUI on cycle day 17 I normally have a 19mm to 20mm follicle on cycle day 12 I’ll trigger and than IUI on cycle day 14 but this time I didn’t get a big enough follicle to trigger yet has anyone had this and what was the outcome ?

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