LH surge in morning not evening.. IUI tomorrow morning

Hello.

I had my surge this morning around 8:30 am. I tested again at 6:30 pm and there was no longer a surge. I’m scheduled to get an <a href="https://glowing.com/glow-fertility-program">IUI</a> tomorrow morning, will it be too late? This will be my second <a href="https://glowing.com/glow-fertility-program">IUI</a>.

Any feedback?!