My 1st IUI scheduled...getting nervous!!!

ML
I actually had a smiley face on my opk Saturday night and negatives on Sunday. I was super nervous that I ovulated but went in for US this morning and RE said ready to go a 16mm and 18.5mm and no I did not ovulate. The IUI is scheduled for Wednesday morning. Gonna trigger  tonight!!! 
Just looking for anyone who can help ease the nerves. This is nerve wracking and I know it's only sort of the beginning.