Hoping I can get some help!

So last year when I was tested on day 3 for FSH it was in the 6 range, today it was 9.6!! And I’m only 26 years old. I got pregnant in December 2018 but sadly had a miscarriage about 4 weeks later.

I am on my second month of Letrozole.

I am freaking out on how it jumped so high within a year and how can I lower it to a better number.

What causes it to increase so high and any advice on how I can lower if that is even possible?

Thanks for any thoughts! 🙂