Clomid to shorten cycle?

Amanda
A little background: my first pregnancy was an uncomplicated full term pregnancy. 2nd pregnancy was a chemical, third was a spontaneous miscarriage at 7 weeks, third was a chemical pregnancy. 
My cycles are long, ovulating anywhere between day 18- 28 & my doc thinks that's the reason for my chemicals- ovulating too late then not being in it's prime when fertilized. My insulin levels are high so I was started on metformin & my next cycle my doc wants me to try clomid days 3-7, do an ultrasound on day 13 or 14 to check follicles and then if there's only one or two we will try for this cycle. 
I've been reading a few threads saying clomid made them ovulate late but that is the opposite of why my doctor wants me to use it. I'm afraid it's going to backfire. Any advice? I'm on cd 16 right now so I will start clomid whenever I start my next cycle.