Brown spotting after femara??

Megan • Married💎Olivia 4/1/17• Baby #2 due in April•metformin.🌻

I haven’t had any period since June 23rd so my dr started me on Letrozole on July 22nd without first starting a period. Its now been 2 days since I stopped that pill and I’m having brown bleeding! Does that mean this didn’t work??