Periods delayed after trigger shot

Hey,

I’m on letrozole from past two cycles. Without letrozole no matter how long my cycles are, my periods start exactly on cycle day 14th post ovulation but with letrozole and trigger shot, my cycle has been delayed for 2-3 days.

Example, I took trigger shot on 26th, I ovulated on 28th I should have started my periods but there is no sign of AF showing same thing happened last cycle.

I did one cycle of letrozole without trigger shot, I got pregnant in that cycle ended up MC though.

Anyone has experienced this?