Slow follicle progression

IUI#2: Had my 2nd ultrasound this cycle today CD15 and my largest follicle is only 13mm. It’s only grown 1mm since CD12. My clinic said I have until Tuesday to test OPKs and if no LH surge they will cancel IUI this cycle.

I’m bummed. Last cycle I had a great response to 2.5 letrozole, peaked CD13, IUI CD14. This cycle is all wonky and I’m wondering if it’s because I’ve been sick with a cold since CD11?

I’m hoping my body will get back on track now that I’m recovering. I hate to put myself through medication and tracking and not ovulate! Plus we are traveling next month and that could mess up timing.

Bummed but patiently waiting.

Anyone have success after slow growth progression?