What is a Mid-Cycle Ultrasound? Are they checking for follicles?

hey girl i don't have n e experiences yet but i know when u go they check if the clomid is doing it for you. im going to go to my ultra sound next week to see if the pill is doing it for me but when i get from the doc.. im going to let every one know how it went well i hope i helped good luck baby dust.....