Normal? BD tomorrow morning too late?

Bonnie • 34 ♏ | Married | TTC for 👶 #1 | Dog Mom 🐾

December on top, January on the bottom:

Is it normal that last month it progressed from low to high to peak and then this month it was low, peak, low?

I told my husband earlier today we need to BD tomorrow morning. So if he isn't avail to BD tonight, does that decrease our chances or should we still be good?