Follicles

I went today and have 2 follicles. One is 13 cm and the other is 20 cm. I was instructed to do our trigger shot tonight. How many of you have actually had good luck with only having 1 large follicle? This worries me that it's only 1 that's large and they didn't want me to continue using my Gonal F. Monday morning is our <a href="https://glowing.com/glow-fertility-program">IUI</a>.