I have always been told not to stim on trigger night. Plus, the follicle is a good size, save your meds!
Good Luck and go seduce that man!
PS- A thought: You said that DH sometimes has a bit of anxiety... what about this: Tell him tonight is no biggie since you are doing IUI, so tell him tonight is just for fun! Then, tomorrow, tell him the pressure is off since you did the deed last night, so the IUI is just a safety! Maybe that will help take the pressure off!