Question about ppl and follicle

Hi ok so I’m doing <a href="https://glowing.com/glow-fertility-program">iui</a> and on cycle day 11 I had 13 and 11mm follicle on my right so we waited few days to Check again before trigger. I got neg opk today and they are giving me a trigger but the egg is ready? How come I’m getting neg opk? I’m afraid the timing won’t be correct .. i ovulate on my own we have MFI and I’m doing trigger for timing. Can someone reassure me so I don’t drive myself crazy?