IUI/trigger question

Hi ladies! I'm on my first clomid/injectable/iui cycle. Took clomid cd 3-7, gonal f injections cd 8-12 of 75 iu, ultrasound on cd 12 showed three 18 mm follicles on my right ovary and one 18 mm follicle on my left ovary. (I've had a previous tubal prehanncy so I have no tube on my right side) I triggered last night around 8:30pm and was supposed to go in for my iui tomorrow morning at 8:45 but we are supposed to be getting a bunch of snow so the office called me today and asked if I could come in this afternoon to do my iui which is only 19 hours post trigger. I'm kind of upset because everything I've read online says it's best to have the iui done 36 hours post trigger. They said they will call me in the morning if they can get there and I could get a second iui if I wanted. Has anyone ever had success having an iui 18-20 hours post trigger? I hope I'm not wasting my money this cycle. I want the best possible chance here. Thanks for listening.. Any advice or comments is appreciated!