Skip a cycle between Letrozole treatments

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Hello!

I am wondering, do you have to skip a cycle to give your body rest between letrozole treatments if the first round doesn’t work, or can you just just go straight into using letrozole again after you get your period from the first cycle (or in my case, I would probably need norethisterone to induce a period again)?

I would appreciate if someone could share their experience with this.

Thank you!