New to Letrozole

Hi there - my first forum post. I was diagnosed with breast cancer over a month ago and subsequently decided to delay surgery until I can have the mastectomy and reconstruction done together. You probably know that Covid 19 has stopped all reconstructive surgery. So I started taking Letrozole just over 2 weeks ago and apart from an occasional nausea and fatigue I'm okay. 

Can anyone tell me if it took some time for side effects to show for them? And if anyone has experienced their tumour shrinking in response to the drug?

This is my second time around with breast cancer. First time was 32 years ago, when I was 30, and I had a lumpectomy, radiotherapy and took Tamoxifen for a couple of years. The cancer's returned in the same breast so mastectomy is the only option now. And reconstruction has to be done from my tummy tissue, not with an implant, because of scar tissue.

And that is all more than I planned to write!! But hello to everyone. Stay safe.