Timing advice

I’m hoping to gather some insight from this group...

My wife and I have the opportunity to inseminate Friday and Monday, but our donor is unavailable Saturday and Sunday.

GLOW is predicting Sunday as the day with the highest chance of conceiving, but last month it was 3-4 days early in its prediction.

Of course we don’t want to miss our window! What do you all think is best? Inseminate both days? Wait til we get a positive opk? Any and all insight is appreciated!