Need input!!!

Alisha
Hey there! A little over a week ago, I started metformin and I got AF yesterday, sorry for the TMI, one huge discharge and then a little spotting in the afternoon and absolutely nothing today. I'm supposed to start Femara (letrozole) on CD3 for the first time ever and that would technically be tomorrow but should I wait until I get a full flow for more than one day? What would you do? I had been getting my AF pretty regularly until August when we likely had a chemical experience. Thanks guys for listening! :)