IUI tomorrow but positive surge happened last night

Me

Sooo my <a href="https://glowing.com/glow-fertility-program">IUI</a> is scheduled for tomorrow AM and we are advised to abstain from sex today BUT I got a positive lh surge last night and it’s already gone today. I also had a TON of mucousy discharge which for me has always been my tell that I am ovulating and it’s time to get busy! Also, my husband has a massive sperm count to begin with. So I’m just not sure should I wait until tomorrow as instructed ( but I’m afraid I’ll miss my chance ) or should we have sex today and still do <a href="https://glowing.com/glow-fertility-program">IUI</a> tomorrow. I’m just nervous because I know the window is so small. Please help!!