Pls help! I have a question

Jessica

I took first dose of letrozole & I took my hcg test a week after to see if I was ovulating. My doctor just called me to tell me I haven’t and they would be adding estrogen into my blood work to see if anything is is my follicles? If not she would be upping my dose. Can someone break this down for me :( I didn’t get a chance to ask her fully bc I was at work.