Cd7 and an 18mm follicle??

So I am now mentally spiraling. I had my fist visit this cycle on day 3. Dr saw what he thought was an 11 mm cyst. Went back today CD7 and the "cyst" may have been a follicle because it is about 18mm now. Wasn't planning on our iui tomorrow but now that might be the new plan. Waiting on blood work to confirm this..... I've been on follistim injections for my last 4 cycles and it seems each cycle I am growing faster and ovulating sooner... Anyone have any experience with this.