IUI question

MomMMa

I got positive on OPK today at 4pm.

My previous doctor would schedule <a href="https://glowing.com/glow-fertility-program">IUI</a> the next day morning but my current doctor is planning to get me <a href="https://glowing.com/glow-fertility-program">IUI</a> on Sunday morning instead(which is 36 hours from my positive OPK). Is this normal? I’m worried it’ll be too late?