Question for anyone who has experienced Metformin

Kara • Trying to conceive baby #2. One amazing little boy, and 3 angels watching over us. 🙏🏼 👼🏼👼🏼👼🏼
I'm on cycle day 81 officially today! I have started Metformin on the 6th of this month, and still no sign of my AF! How long did it take for any of you to get your AF or ovulate after taking metformin. I'm getting worried that it's not working 😩😩